greenplumn execExprInterp 源码
greenplumn execExprInterp 代码
文件路径：/src/backend/executor/execExprInterp.c
/*-------------------------------------------------------------------------
*
* execExprInterp.c
* Interpreted evaluation of an expression step list.
*
* This file provides either a "direct threaded" (for gcc, clang and
* compatible) or a "switch threaded" (for all compilers) implementation of
* expression evaluation. The former is amongst the fastest known methods
* of interpreting programs without resorting to assembly level work, or
* just-in-time compilation, but it requires support for computed gotos.
* The latter is amongst the fastest approaches doable in standard C.
*
* In either case we use ExprEvalStep->opcode to dispatch to the code block
* within ExecInterpExpr() that implements the specific opcode type.
*
* Switch-threading uses a plain switch() statement to perform the
* dispatch. This has the advantages of being plain C and allowing the
* compiler to warn if implementation of a specific opcode has been forgotten.
* The disadvantage is that dispatches will, as commonly implemented by
* compilers, happen from a single location, requiring more jumps and causing
* bad branch prediction.
*
* In direct threading, we use gcc's label-as-values extension - also adopted
* by some other compilers - to replace ExprEvalStep->opcode with the address
* of the block implementing the instruction. Dispatch to the next instruction
* is done by a "computed goto". This allows for better branch prediction
* (as the jumps are happening from different locations) and fewer jumps
* (as no preparatory jump to a common dispatch location is needed).
*
* When using direct threading, ExecReadyInterpretedExpr will replace
* each step's opcode field with the address of the relevant code block and
* ExprState->flags will contain EEO_FLAG_DIRECT_THREADED to remember that
* that's been done.
*
* For very simple instructions the overhead of the full interpreter
* "startup", as minimal as it is, is noticeable. Therefore
* ExecReadyInterpretedExpr will choose to implement certain simple
* opcode patterns using special fast-path routines (ExecJust*).
*
* Complex or uncommon instructions are not implemented in-line in
* ExecInterpExpr(), rather we call out to a helper function appearing later
* in this file. For one reason, there'd not be a noticeable performance
* benefit, but more importantly those complex routines are intended to be
* shared between different expression evaluation approaches. For instance
* a JIT compiler would generate calls to them. (This is why they are
* exported rather than being "static" in this file.)
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/executor/execExprInterp.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/tuptoaster.h"
#include "catalog/pg_type.h"
#include "commands/sequence.h"
#include "executor/execExpr.h"
#include "executor/nodeSubplan.h"
#include "funcapi.h"
#include "utils/memutils.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "parser/parsetree.h"
#include "pgstat.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datum.h"
#include "utils/expandedrecord.h"
#include "utils/lsyscache.h"
#include "utils/timestamp.h"
#include "utils/typcache.h"
#include "utils/xml.h"
#include "cdb/cdbvars.h"
#include "utils/fmgroids.h"
/*
* Use computed-goto-based opcode dispatch when computed gotos are available.
* But use a separate symbol so that it's easy to adjust locally in this file
* for development and testing.
*/
#ifdef HAVE_COMPUTED_GOTO
#define EEO_USE_COMPUTED_GOTO
#endif /* HAVE_COMPUTED_GOTO */
/*
* Macros for opcode dispatch.
*
* EEO_SWITCH - just hides the switch if not in use.
* EEO_CASE - labels the implementation of named expression step type.
* EEO_DISPATCH - jump to the implementation of the step type for 'op'.
* EEO_OPCODE - compute opcode required by used expression evaluation method.
* EEO_NEXT - increment 'op' and jump to correct next step type.
* EEO_JUMP - jump to the specified step number within the current expression.
*/
#if defined(EEO_USE_COMPUTED_GOTO)
/* struct for jump target -> opcode lookup table */
typedef struct ExprEvalOpLookup
{
const void *opcode;
ExprEvalOp op;
} ExprEvalOpLookup;
/* to make dispatch_table accessible outside ExecInterpExpr() */
static const void **dispatch_table = NULL;
/* jump target -> opcode lookup table */
static ExprEvalOpLookup reverse_dispatch_table[EEOP_LAST];
#define EEO_SWITCH()
#define EEO_CASE(name) CASE_##name:
#define EEO_DISPATCH() goto *((void *) op->opcode)
#define EEO_OPCODE(opcode) ((intptr_t) dispatch_table[opcode])
#else /* !EEO_USE_COMPUTED_GOTO */
#define EEO_SWITCH() starteval: switch ((ExprEvalOp) op->opcode)
#define EEO_CASE(name) case name:
#define EEO_DISPATCH() goto starteval
#define EEO_OPCODE(opcode) (opcode)
#endif /* EEO_USE_COMPUTED_GOTO */
#define EEO_NEXT() \
do { \
op++; \
EEO_DISPATCH(); \
} while (0)
#define EEO_JUMP(stepno) \
do { \
op = &state->steps[stepno]; \
EEO_DISPATCH(); \
} while (0)
static Datum ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull);
static void ExecInitInterpreter(void);
/* support functions */
static void CheckVarSlotCompatibility(TupleTableSlot *slot, int attnum, Oid vartype);
static void CheckOpSlotCompatibility(ExprEvalStep *op, TupleTableSlot *slot);
static TupleDesc get_cached_rowtype(Oid type_id, int32 typmod,
TupleDesc *cache_field, ExprContext *econtext);
static void ShutdownTupleDescRef(Datum arg);
static void ExecEvalRowNullInt(ExprState *state, ExprEvalStep *op,
ExprContext *econtext, bool checkisnull);
/* fast-path evaluation functions */
static Datum ExecJustInnerVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustOuterVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustScanVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustConst(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustAssignInnerVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustAssignOuterVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustAssignScanVar(ExprState *state, ExprContext *econtext, bool *isnull);
static Datum ExecJustApplyFuncToCase(ExprState *state, ExprContext *econtext, bool *isnull);
/*
* Prepare ExprState for interpreted execution.
*/
void
ExecReadyInterpretedExpr(ExprState *state)
{
/* Ensure one-time interpreter setup has been done */
ExecInitInterpreter();
/* Simple validity checks on expression */
Assert(state->steps_len >= 1);
Assert(state->steps[state->steps_len - 1].opcode == EEOP_DONE);
/*
* Don't perform redundant initialization. This is unreachable in current
* cases, but might be hit if there's additional expression evaluation
* methods that rely on interpreted execution to work.
*/
if (state->flags & EEO_FLAG_INTERPRETER_INITIALIZED)
return;
/*
* First time through, check whether attribute matches Var. Might not be
* ok anymore, due to schema changes. We do that by setting up a callback
* that does checking on the first call, which then sets the evalfunc
* callback to the actual method of execution.
*/
state->evalfunc = ExecInterpExprStillValid;
/* DIRECT_THREADED should not already be set */
Assert((state->flags & EEO_FLAG_DIRECT_THREADED) == 0);
/*
* There shouldn't be any errors before the expression is fully
* initialized, and even if so, it'd lead to the expression being
* abandoned. So we can set the flag now and save some code.
*/
state->flags |= EEO_FLAG_INTERPRETER_INITIALIZED;
/*
* Select fast-path evalfuncs for very simple expressions. "Starting up"
* the full interpreter is a measurable overhead for these, and these
* patterns occur often enough to be worth optimizing.
*/
if (state->steps_len == 3)
{
ExprEvalOp step0 = state->steps[0].opcode;
ExprEvalOp step1 = state->steps[1].opcode;
if (step0 == EEOP_INNER_FETCHSOME &&
step1 == EEOP_INNER_VAR)
{
state->evalfunc_private = (void *) ExecJustInnerVar;
return;
}
else if (step0 == EEOP_OUTER_FETCHSOME &&
step1 == EEOP_OUTER_VAR)
{
state->evalfunc_private = (void *) ExecJustOuterVar;
return;
}
else if (step0 == EEOP_SCAN_FETCHSOME &&
step1 == EEOP_SCAN_VAR)
{
state->evalfunc_private = (void *) ExecJustScanVar;
return;
}
else if (step0 == EEOP_INNER_FETCHSOME &&
step1 == EEOP_ASSIGN_INNER_VAR)
{
state->evalfunc_private = (void *) ExecJustAssignInnerVar;
return;
}
else if (step0 == EEOP_OUTER_FETCHSOME &&
step1 == EEOP_ASSIGN_OUTER_VAR)
{
state->evalfunc_private = (void *) ExecJustAssignOuterVar;
return;
}
else if (step0 == EEOP_SCAN_FETCHSOME &&
step1 == EEOP_ASSIGN_SCAN_VAR)
{
state->evalfunc_private = (void *) ExecJustAssignScanVar;
return;
}
else if (step0 == EEOP_CASE_TESTVAL &&
step1 == EEOP_FUNCEXPR_STRICT &&
state->steps[0].d.casetest.value)
{
state->evalfunc_private = (void *) ExecJustApplyFuncToCase;
return;
}
}
else if (state->steps_len == 2 &&
state->steps[0].opcode == EEOP_CONST)
{
state->evalfunc_private = (void *) ExecJustConst;
return;
}
#if defined(EEO_USE_COMPUTED_GOTO)
/*
* In the direct-threaded implementation, replace each opcode with the
* address to jump to. (Use ExecEvalStepOp() to get back the opcode.)
*/
{
int off;
for (off = 0; off < state->steps_len; off++)
{
ExprEvalStep *op = &state->steps[off];
op->opcode = EEO_OPCODE(op->opcode);
}
state->flags |= EEO_FLAG_DIRECT_THREADED;
}
#endif /* EEO_USE_COMPUTED_GOTO */
state->evalfunc_private = (void *) ExecInterpExpr;
}
/*
* Evaluate expression identified by "state" in the execution context
* given by "econtext". *isnull is set to the is-null flag for the result,
* and the Datum value is the function result.
*
* As a special case, return the dispatch table's address if state is NULL.
* This is used by ExecInitInterpreter to set up the dispatch_table global.
* (Only applies when EEO_USE_COMPUTED_GOTO is defined.)
*/
static Datum
ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op;
TupleTableSlot *resultslot;
TupleTableSlot *innerslot;
TupleTableSlot *outerslot;
TupleTableSlot *scanslot;
/*
* This array has to be in the same order as enum ExprEvalOp.
*/
#if defined(EEO_USE_COMPUTED_GOTO)
static const void *const dispatch_table[] = {
&&CASE_EEOP_DONE,
&&CASE_EEOP_INNER_FETCHSOME,
&&CASE_EEOP_OUTER_FETCHSOME,
&&CASE_EEOP_SCAN_FETCHSOME,
&&CASE_EEOP_INNER_VAR,
&&CASE_EEOP_OUTER_VAR,
&&CASE_EEOP_SCAN_VAR,
&&CASE_EEOP_INNER_SYSVAR,
&&CASE_EEOP_OUTER_SYSVAR,
&&CASE_EEOP_SCAN_SYSVAR,
&&CASE_EEOP_WHOLEROW,
&&CASE_EEOP_ASSIGN_INNER_VAR,
&&CASE_EEOP_ASSIGN_OUTER_VAR,
&&CASE_EEOP_ASSIGN_SCAN_VAR,
&&CASE_EEOP_ASSIGN_TMP,
&&CASE_EEOP_ASSIGN_TMP_MAKE_RO,
&&CASE_EEOP_CONST,
&&CASE_EEOP_FUNCEXPR,
&&CASE_EEOP_FUNCEXPR_STRICT,
&&CASE_EEOP_FUNCEXPR_FUSAGE,
&&CASE_EEOP_FUNCEXPR_STRICT_FUSAGE,
&&CASE_EEOP_BOOL_AND_STEP_FIRST,
&&CASE_EEOP_BOOL_AND_STEP,
&&CASE_EEOP_BOOL_AND_STEP_LAST,
&&CASE_EEOP_BOOL_OR_STEP_FIRST,
&&CASE_EEOP_BOOL_OR_STEP,
&&CASE_EEOP_BOOL_OR_STEP_LAST,
&&CASE_EEOP_BOOL_NOT_STEP,
&&CASE_EEOP_QUAL,
&&CASE_EEOP_JUMP,
&&CASE_EEOP_JUMP_IF_NULL,
&&CASE_EEOP_JUMP_IF_NOT_NULL,
&&CASE_EEOP_JUMP_IF_NOT_TRUE,
&&CASE_EEOP_NULLTEST_ISNULL,
&&CASE_EEOP_NULLTEST_ISNOTNULL,
&&CASE_EEOP_NULLTEST_ROWISNULL,
&&CASE_EEOP_NULLTEST_ROWISNOTNULL,
&&CASE_EEOP_BOOLTEST_IS_TRUE,
&&CASE_EEOP_BOOLTEST_IS_NOT_TRUE,
&&CASE_EEOP_BOOLTEST_IS_FALSE,
&&CASE_EEOP_BOOLTEST_IS_NOT_FALSE,
&&CASE_EEOP_PARAM_EXEC,
&&CASE_EEOP_PARAM_EXTERN,
&&CASE_EEOP_PARAM_CALLBACK,
&&CASE_EEOP_CASE_TESTVAL,
&&CASE_EEOP_MAKE_READONLY,
&&CASE_EEOP_IOCOERCE,
&&CASE_EEOP_DISTINCT,
&&CASE_EEOP_NOT_DISTINCT,
&&CASE_EEOP_NULLIF,
&&CASE_EEOP_SQLVALUEFUNCTION,
&&CASE_EEOP_CURRENTOFEXPR,
&&CASE_EEOP_NEXTVALUEEXPR,
&&CASE_EEOP_ARRAYEXPR,
&&CASE_EEOP_ARRAYCOERCE,
&&CASE_EEOP_ROW,
&&CASE_EEOP_ROWCOMPARE_STEP,
&&CASE_EEOP_ROWCOMPARE_FINAL,
&&CASE_EEOP_MINMAX,
&&CASE_EEOP_FIELDSELECT,
&&CASE_EEOP_FIELDSTORE_DEFORM,
&&CASE_EEOP_FIELDSTORE_FORM,
&&CASE_EEOP_SBSREF_SUBSCRIPT,
&&CASE_EEOP_SBSREF_OLD,
&&CASE_EEOP_SBSREF_ASSIGN,
&&CASE_EEOP_SBSREF_FETCH,
&&CASE_EEOP_DOMAIN_TESTVAL,
&&CASE_EEOP_DOMAIN_NOTNULL,
&&CASE_EEOP_DOMAIN_CHECK,
&&CASE_EEOP_CONVERT_ROWTYPE,
&&CASE_EEOP_SCALARARRAYOP,
&&CASE_EEOP_SCALARARRAYOP_FAST_INT,
&&CASE_EEOP_SCALARARRAYOP_FAST_STR,
&&CASE_EEOP_XMLEXPR,
&&CASE_EEOP_AGGREF,
&&CASE_EEOP_GROUPING_FUNC,
&&CASE_EEOP_GROUP_ID,
&&CASE_EEOP_GROUPING_SET_ID,
&&CASE_EEOP_AGGEXPR_ID,
&&CASE_EEOP_ROWIDEXPR,
&&CASE_EEOP_WINDOW_FUNC,
&&CASE_EEOP_SUBPLAN,
&&CASE_EEOP_ALTERNATIVE_SUBPLAN,
&&CASE_EEOP_AGG_STRICT_DESERIALIZE,
&&CASE_EEOP_AGG_DESERIALIZE,
&&CASE_EEOP_AGG_STRICT_INPUT_CHECK_ARGS,
&&CASE_EEOP_AGG_STRICT_INPUT_CHECK_NULLS,
&&CASE_EEOP_AGG_INIT_TRANS,
&&CASE_EEOP_AGG_STRICT_TRANS_CHECK,
&&CASE_EEOP_AGG_PLAIN_PERGROUP_NULLCHECK,
&&CASE_EEOP_AGG_PLAIN_TRANS_BYVAL,
&&CASE_EEOP_AGG_PLAIN_TRANS,
&&CASE_EEOP_AGG_ORDERED_TRANS_DATUM,
&&CASE_EEOP_AGG_ORDERED_TRANS_TUPLE,
&&CASE_EEOP_LAST
};
StaticAssertStmt(EEOP_LAST + 1 == lengthof(dispatch_table),
"dispatch_table out of whack with ExprEvalOp");
if (unlikely(state == NULL))
return PointerGetDatum(dispatch_table);
#else
Assert(state != NULL);
#endif /* EEO_USE_COMPUTED_GOTO */
/* setup state */
op = state->steps;
resultslot = state->resultslot;
innerslot = econtext->ecxt_innertuple;
outerslot = econtext->ecxt_outertuple;
scanslot = econtext->ecxt_scantuple;
#if defined(EEO_USE_COMPUTED_GOTO)
EEO_DISPATCH();
#endif
EEO_SWITCH()
{
EEO_CASE(EEOP_DONE)
{
goto out;
}
EEO_CASE(EEOP_INNER_FETCHSOME)
{
CheckOpSlotCompatibility(op, innerslot);
slot_getsomeattrs(innerslot, op->d.fetch.last_var);
EEO_NEXT();
}
EEO_CASE(EEOP_OUTER_FETCHSOME)
{
CheckOpSlotCompatibility(op, outerslot);
slot_getsomeattrs(outerslot, op->d.fetch.last_var);
EEO_NEXT();
}
EEO_CASE(EEOP_SCAN_FETCHSOME)
{
CheckOpSlotCompatibility(op, scanslot);
slot_getsomeattrs(scanslot, op->d.fetch.last_var);
EEO_NEXT();
}
EEO_CASE(EEOP_INNER_VAR)
{
int attnum = op->d.var.attnum;
/*
* Since we already extracted all referenced columns from the
* tuple with a FETCHSOME step, we can just grab the value
* directly out of the slot's decomposed-data arrays. But let's
* have an Assert to check that that did happen.
*/
Assert(attnum >= 0 && attnum < innerslot->tts_nvalid);
*op->resvalue = innerslot->tts_values[attnum];
*op->resnull = innerslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_OUTER_VAR)
{
int attnum = op->d.var.attnum;
/* See EEOP_INNER_VAR comments */
Assert(attnum >= 0 && attnum < outerslot->tts_nvalid);
*op->resvalue = outerslot->tts_values[attnum];
*op->resnull = outerslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_SCAN_VAR)
{
int attnum = op->d.var.attnum;
/* See EEOP_INNER_VAR comments */
Assert(attnum >= 0 && attnum < scanslot->tts_nvalid);
*op->resvalue = scanslot->tts_values[attnum];
*op->resnull = scanslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_INNER_SYSVAR)
{
ExecEvalSysVar(state, op, econtext, innerslot);
EEO_NEXT();
}
EEO_CASE(EEOP_OUTER_SYSVAR)
{
ExecEvalSysVar(state, op, econtext, outerslot);
EEO_NEXT();
}
EEO_CASE(EEOP_SCAN_SYSVAR)
{
ExecEvalSysVar(state, op, econtext, scanslot);
EEO_NEXT();
}
EEO_CASE(EEOP_WHOLEROW)
{
/* too complex for an inline implementation */
ExecEvalWholeRowVar(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_ASSIGN_INNER_VAR)
{
int resultnum = op->d.assign_var.resultnum;
int attnum = op->d.assign_var.attnum;
/*
* We do not need CheckVarSlotCompatibility here; that was taken
* care of at compilation time. But see EEOP_INNER_VAR comments.
*/
Assert(attnum >= 0 && attnum < innerslot->tts_nvalid);
resultslot->tts_values[resultnum] = innerslot->tts_values[attnum];
resultslot->tts_isnull[resultnum] = innerslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_ASSIGN_OUTER_VAR)
{
int resultnum = op->d.assign_var.resultnum;
int attnum = op->d.assign_var.attnum;
/*
* We do not need CheckVarSlotCompatibility here; that was taken
* care of at compilation time. But see EEOP_INNER_VAR comments.
*/
Assert(attnum >= 0 && attnum < outerslot->tts_nvalid);
resultslot->tts_values[resultnum] = outerslot->tts_values[attnum];
resultslot->tts_isnull[resultnum] = outerslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_ASSIGN_SCAN_VAR)
{
int resultnum = op->d.assign_var.resultnum;
int attnum = op->d.assign_var.attnum;
/*
* We do not need CheckVarSlotCompatibility here; that was taken
* care of at compilation time. But see EEOP_INNER_VAR comments.
*/
Assert(attnum >= 0 && attnum < scanslot->tts_nvalid);
resultslot->tts_values[resultnum] = scanslot->tts_values[attnum];
resultslot->tts_isnull[resultnum] = scanslot->tts_isnull[attnum];
EEO_NEXT();
}
EEO_CASE(EEOP_ASSIGN_TMP)
{
int resultnum = op->d.assign_tmp.resultnum;
resultslot->tts_values[resultnum] = state->resvalue;
resultslot->tts_isnull[resultnum] = state->resnull;
EEO_NEXT();
}
EEO_CASE(EEOP_ASSIGN_TMP_MAKE_RO)
{
int resultnum = op->d.assign_tmp.resultnum;
resultslot->tts_isnull[resultnum] = state->resnull;
if (!resultslot->tts_isnull[resultnum])
resultslot->tts_values[resultnum] =
MakeExpandedObjectReadOnlyInternal(state->resvalue);
else
resultslot->tts_values[resultnum] = state->resvalue;
EEO_NEXT();
}
EEO_CASE(EEOP_CONST)
{
*op->resnull = op->d.constval.isnull;
*op->resvalue = op->d.constval.value;
EEO_NEXT();
}
/*
* Function-call implementations. Arguments have previously been
* evaluated directly into fcinfo->args.
*
* As both STRICT checks and function-usage are noticeable performance
* wise, and function calls are a very hot-path (they also back
* operators!), it's worth having so many separate opcodes.
*
* Note: the reason for using a temporary variable "d", here and in
* other places, is that some compilers think "*op->resvalue = f();"
* requires them to evaluate op->resvalue into a register before
* calling f(), just in case f() is able to modify op->resvalue
* somehow. The extra line of code can save a useless register spill
* and reload across the function call.
*/
EEO_CASE(EEOP_FUNCEXPR)
{
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
Datum d;
fcinfo->isnull = false;
d = op->d.func.fn_addr(fcinfo);
*op->resvalue = d;
*op->resnull = fcinfo->isnull;
EEO_NEXT();
}
EEO_CASE(EEOP_FUNCEXPR_STRICT)
{
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
NullableDatum *args = fcinfo->args;
int argno;
Datum d;
/* strict function, so check for NULL args */
for (argno = 0; argno < op->d.func.nargs; argno++)
{
if (args[argno].isnull)
{
*op->resnull = true;
goto strictfail;
}
}
fcinfo->isnull = false;
d = op->d.func.fn_addr(fcinfo);
*op->resvalue = d;
*op->resnull = fcinfo->isnull;
strictfail:
EEO_NEXT();
}
EEO_CASE(EEOP_FUNCEXPR_FUSAGE)
{
/* not common enough to inline */
ExecEvalFuncExprFusage(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_FUNCEXPR_STRICT_FUSAGE)
{
/* not common enough to inline */
ExecEvalFuncExprStrictFusage(state, op, econtext);
EEO_NEXT();
}
/*
* If any of its clauses is FALSE, an AND's result is FALSE regardless
* of the states of the rest of the clauses, so we can stop evaluating
* and return FALSE immediately. If none are FALSE and one or more is
* NULL, we return NULL; otherwise we return TRUE. This makes sense
* when you interpret NULL as "don't know": perhaps one of the "don't
* knows" would have been FALSE if we'd known its value. Only when
* all the inputs are known to be TRUE can we state confidently that
* the AND's result is TRUE.
*/
EEO_CASE(EEOP_BOOL_AND_STEP_FIRST)
{
*op->d.boolexpr.anynull = false;
/*
* EEOP_BOOL_AND_STEP_FIRST resets anynull, otherwise it's the
* same as EEOP_BOOL_AND_STEP - so fall through to that.
*/
/* FALL THROUGH */
}
EEO_CASE(EEOP_BOOL_AND_STEP)
{
if (*op->resnull)
{
*op->d.boolexpr.anynull = true;
}
else if (!DatumGetBool(*op->resvalue))
{
/* result is already set to FALSE, need not change it */
/* bail out early */
EEO_JUMP(op->d.boolexpr.jumpdone);
}
EEO_NEXT();
}
EEO_CASE(EEOP_BOOL_AND_STEP_LAST)
{
if (*op->resnull)
{
/* result is already set to NULL, need not change it */
}
else if (!DatumGetBool(*op->resvalue))
{
/* result is already set to FALSE, need not change it */
/*
* No point jumping early to jumpdone - would be same target
* (as this is the last argument to the AND expression),
* except more expensive.
*/
}
else if (*op->d.boolexpr.anynull)
{
*op->resvalue = (Datum) 0;
*op->resnull = true;
}
else
{
/* result is already set to TRUE, need not change it */
}
EEO_NEXT();
}
/*
* If any of its clauses is TRUE, an OR's result is TRUE regardless of
* the states of the rest of the clauses, so we can stop evaluating
* and return TRUE immediately. If none are TRUE and one or more is
* NULL, we return NULL; otherwise we return FALSE. This makes sense
* when you interpret NULL as "don't know": perhaps one of the "don't
* knows" would have been TRUE if we'd known its value. Only when all
* the inputs are known to be FALSE can we state confidently that the
* OR's result is FALSE.
*/
EEO_CASE(EEOP_BOOL_OR_STEP_FIRST)
{
*op->d.boolexpr.anynull = false;
/*
* EEOP_BOOL_OR_STEP_FIRST resets anynull, otherwise it's the same
* as EEOP_BOOL_OR_STEP - so fall through to that.
*/
/* FALL THROUGH */
}
EEO_CASE(EEOP_BOOL_OR_STEP)
{
if (*op->resnull)
{
*op->d.boolexpr.anynull = true;
}
else if (DatumGetBool(*op->resvalue))
{
/* result is already set to TRUE, need not change it */
/* bail out early */
EEO_JUMP(op->d.boolexpr.jumpdone);
}
EEO_NEXT();
}
EEO_CASE(EEOP_BOOL_OR_STEP_LAST)
{
if (*op->resnull)
{
/* result is already set to NULL, need not change it */
}
else if (DatumGetBool(*op->resvalue))
{
/* result is already set to TRUE, need not change it */
/*
* No point jumping to jumpdone - would be same target (as
* this is the last argument to the AND expression), except
* more expensive.
*/
}
else if (*op->d.boolexpr.anynull)
{
*op->resvalue = (Datum) 0;
*op->resnull = true;
}
else
{
/* result is already set to FALSE, need not change it */
}
EEO_NEXT();
}
EEO_CASE(EEOP_BOOL_NOT_STEP)
{
/*
* Evaluation of 'not' is simple... if expr is false, then return
* 'true' and vice versa. It's safe to do this even on a
* nominally null value, so we ignore resnull; that means that
* NULL in produces NULL out, which is what we want.
*/
*op->resvalue = BoolGetDatum(!DatumGetBool(*op->resvalue));
EEO_NEXT();
}
EEO_CASE(EEOP_QUAL)
{
/* simplified version of BOOL_AND_STEP for use by ExecQual() */
/* If argument (also result) is false or null ... */
if (*op->resnull ||
!DatumGetBool(*op->resvalue))
{
/* ... bail out early, returning FALSE */
*op->resnull = false;
*op->resvalue = BoolGetDatum(false);
EEO_JUMP(op->d.qualexpr.jumpdone);
}
/*
* Otherwise, leave the TRUE value in place, in case this is the
* last qual. Then, TRUE is the correct answer.
*/
EEO_NEXT();
}
EEO_CASE(EEOP_JUMP)
{
/* Unconditionally jump to target step */
EEO_JUMP(op->d.jump.jumpdone);
}
EEO_CASE(EEOP_JUMP_IF_NULL)
{
/* Transfer control if current result is null */
if (*op->resnull)
EEO_JUMP(op->d.jump.jumpdone);
EEO_NEXT();
}
EEO_CASE(EEOP_JUMP_IF_NOT_NULL)
{
/* Transfer control if current result is non-null */
if (!*op->resnull)
EEO_JUMP(op->d.jump.jumpdone);
EEO_NEXT();
}
EEO_CASE(EEOP_JUMP_IF_NOT_TRUE)
{
/* Transfer control if current result is null or false */
if (*op->resnull || !DatumGetBool(*op->resvalue))
EEO_JUMP(op->d.jump.jumpdone);
EEO_NEXT();
}
EEO_CASE(EEOP_NULLTEST_ISNULL)
{
*op->resvalue = BoolGetDatum(*op->resnull);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_NULLTEST_ISNOTNULL)
{
*op->resvalue = BoolGetDatum(!*op->resnull);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_NULLTEST_ROWISNULL)
{
/* out of line implementation: too large */
ExecEvalRowNull(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_NULLTEST_ROWISNOTNULL)
{
/* out of line implementation: too large */
ExecEvalRowNotNull(state, op, econtext);
EEO_NEXT();
}
/* BooleanTest implementations for all booltesttypes */
EEO_CASE(EEOP_BOOLTEST_IS_TRUE)
{
if (*op->resnull)
{
*op->resvalue = BoolGetDatum(false);
*op->resnull = false;
}
/* else, input value is the correct output as well */
EEO_NEXT();
}
EEO_CASE(EEOP_BOOLTEST_IS_NOT_TRUE)
{
if (*op->resnull)
{
*op->resvalue = BoolGetDatum(true);
*op->resnull = false;
}
else
*op->resvalue = BoolGetDatum(!DatumGetBool(*op->resvalue));
EEO_NEXT();
}
EEO_CASE(EEOP_BOOLTEST_IS_FALSE)
{
if (*op->resnull)
{
*op->resvalue = BoolGetDatum(false);
*op->resnull = false;
}
else
*op->resvalue = BoolGetDatum(!DatumGetBool(*op->resvalue));
EEO_NEXT();
}
EEO_CASE(EEOP_BOOLTEST_IS_NOT_FALSE)
{
if (*op->resnull)
{
*op->resvalue = BoolGetDatum(true);
*op->resnull = false;
}
/* else, input value is the correct output as well */
EEO_NEXT();
}
EEO_CASE(EEOP_PARAM_EXEC)
{
/* out of line implementation: too large */
ExecEvalParamExec(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_PARAM_EXTERN)
{
/* out of line implementation: too large */
ExecEvalParamExtern(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_PARAM_CALLBACK)
{
/* allow an extension module to supply a PARAM_EXTERN value */
op->d.cparam.paramfunc(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_CASE_TESTVAL)
{
/*
* Normally upper parts of the expression tree have setup the
* values to be returned here, but some parts of the system
* currently misuse {caseValue,domainValue}_{datum,isNull} to set
* run-time data. So if no values have been set-up, use
* ExprContext's. This isn't pretty, but also not *that* ugly,
* and this is unlikely to be performance sensitive enough to
* worry about an extra branch.
*/
if (op->d.casetest.value)
{
*op->resvalue = *op->d.casetest.value;
*op->resnull = *op->d.casetest.isnull;
}
else
{
*op->resvalue = econtext->caseValue_datum;
*op->resnull = econtext->caseValue_isNull;
}
EEO_NEXT();
}
EEO_CASE(EEOP_DOMAIN_TESTVAL)
{
/*
* See EEOP_CASE_TESTVAL comment.
*/
if (op->d.casetest.value)
{
*op->resvalue = *op->d.casetest.value;
*op->resnull = *op->d.casetest.isnull;
}
else
{
*op->resvalue = econtext->domainValue_datum;
*op->resnull = econtext->domainValue_isNull;
}
EEO_NEXT();
}
EEO_CASE(EEOP_MAKE_READONLY)
{
/*
* Force a varlena value that might be read multiple times to R/O
*/
if (!*op->d.make_readonly.isnull)
*op->resvalue =
MakeExpandedObjectReadOnlyInternal(*op->d.make_readonly.value);
*op->resnull = *op->d.make_readonly.isnull;
EEO_NEXT();
}
EEO_CASE(EEOP_IOCOERCE)
{
/*
* Evaluate a CoerceViaIO node. This can be quite a hot path, so
* inline as much work as possible. The source value is in our
* result variable.
*/
char *str;
/* call output function (similar to OutputFunctionCall) */
if (*op->resnull)
{
/* output functions are not called on nulls */
str = NULL;
}
else
{
FunctionCallInfo fcinfo_out;
fcinfo_out = op->d.iocoerce.fcinfo_data_out;
fcinfo_out->args[0].value = *op->resvalue;
fcinfo_out->args[0].isnull = false;
fcinfo_out->isnull = false;
str = DatumGetCString(FunctionCallInvoke(fcinfo_out));
/* OutputFunctionCall assumes result isn't null */
Assert(!fcinfo_out->isnull);
}
/* call input function (similar to InputFunctionCall) */
if (!op->d.iocoerce.finfo_in->fn_strict || str != NULL)
{
FunctionCallInfo fcinfo_in;
Datum d;
fcinfo_in = op->d.iocoerce.fcinfo_data_in;
fcinfo_in->args[0].value = PointerGetDatum(str);
fcinfo_in->args[0].isnull = *op->resnull;
/* second and third arguments are already set up */
fcinfo_in->isnull = false;
d = FunctionCallInvoke(fcinfo_in);
*op->resvalue = d;
/* Should get null result if and only if str is NULL */
if (str == NULL)
{
Assert(*op->resnull);
Assert(fcinfo_in->isnull);
}
else
{
Assert(!*op->resnull);
Assert(!fcinfo_in->isnull);
}
}
EEO_NEXT();
}
EEO_CASE(EEOP_DISTINCT)
{
/*
* IS DISTINCT FROM must evaluate arguments (already done into
* fcinfo->args) to determine whether they are NULL; if either is
* NULL then the result is determined. If neither is NULL, then
* proceed to evaluate the comparison function, which is just the
* type's standard equality operator. We need not care whether
* that function is strict. Because the handling of nulls is
* different, we can't just reuse EEOP_FUNCEXPR.
*/
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
/* check function arguments for NULLness */
if (fcinfo->args[0].isnull && fcinfo->args[1].isnull)
{
/* Both NULL? Then is not distinct... */
*op->resvalue = BoolGetDatum(false);
*op->resnull = false;
}
else if (fcinfo->args[0].isnull || fcinfo->args[1].isnull)
{
/* Only one is NULL? Then is distinct... */
*op->resvalue = BoolGetDatum(true);
*op->resnull = false;
}
else
{
/* Neither null, so apply the equality function */
Datum eqresult;
fcinfo->isnull = false;
eqresult = op->d.func.fn_addr(fcinfo);
/* Must invert result of "="; safe to do even if null */
*op->resvalue = BoolGetDatum(!DatumGetBool(eqresult));
*op->resnull = fcinfo->isnull;
}
EEO_NEXT();
}
/* see EEOP_DISTINCT for comments, this is just inverted */
EEO_CASE(EEOP_NOT_DISTINCT)
{
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
if (fcinfo->args[0].isnull && fcinfo->args[1].isnull)
{
*op->resvalue = BoolGetDatum(true);
*op->resnull = false;
}
else if (fcinfo->args[0].isnull || fcinfo->args[1].isnull)
{
*op->resvalue = BoolGetDatum(false);
*op->resnull = false;
}
else
{
Datum eqresult;
fcinfo->isnull = false;
eqresult = op->d.func.fn_addr(fcinfo);
*op->resvalue = eqresult;
*op->resnull = fcinfo->isnull;
}
EEO_NEXT();
}
EEO_CASE(EEOP_NULLIF)
{
/*
* The arguments are already evaluated into fcinfo->args.
*/
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
/* if either argument is NULL they can't be equal */
if (!fcinfo->args[0].isnull && !fcinfo->args[1].isnull)
{
Datum result;
fcinfo->isnull = false;
result = op->d.func.fn_addr(fcinfo);
/* if the arguments are equal return null */
if (!fcinfo->isnull && DatumGetBool(result))
{
*op->resvalue = (Datum) 0;
*op->resnull = true;
EEO_NEXT();
}
}
/* Arguments aren't equal, so return the first one */
*op->resvalue = fcinfo->args[0].value;
*op->resnull = fcinfo->args[0].isnull;
EEO_NEXT();
}
EEO_CASE(EEOP_SQLVALUEFUNCTION)
{
/*
* Doesn't seem worthwhile to have an inline implementation
* efficiency-wise.
*/
ExecEvalSQLValueFunction(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_CURRENTOFEXPR)
{
/* error invocation uses space, and shouldn't ever occur */
ExecEvalCurrentOfExpr(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_NEXTVALUEEXPR)
{
/*
* Doesn't seem worthwhile to have an inline implementation
* efficiency-wise.
*/
ExecEvalNextValueExpr(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_ARRAYEXPR)
{
/* too complex for an inline implementation */
ExecEvalArrayExpr(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_ARRAYCOERCE)
{
/* too complex for an inline implementation */
ExecEvalArrayCoerce(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_ROW)
{
/* too complex for an inline implementation */
ExecEvalRow(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_ROWCOMPARE_STEP)
{
FunctionCallInfo fcinfo = op->d.rowcompare_step.fcinfo_data;
Datum d;
/* force NULL result if strict fn and NULL input */
if (op->d.rowcompare_step.finfo->fn_strict &&
(fcinfo->args[0].isnull || fcinfo->args[1].isnull))
{
*op->resnull = true;
EEO_JUMP(op->d.rowcompare_step.jumpnull);
}
/* Apply comparison function */
fcinfo->isnull = false;
d = op->d.rowcompare_step.fn_addr(fcinfo);
*op->resvalue = d;
/* force NULL result if NULL function result */
if (fcinfo->isnull)
{
*op->resnull = true;
EEO_JUMP(op->d.rowcompare_step.jumpnull);
}
*op->resnull = false;
/* If unequal, no need to compare remaining columns */
if (DatumGetInt32(*op->resvalue) != 0)
{
EEO_JUMP(op->d.rowcompare_step.jumpdone);
}
EEO_NEXT();
}
EEO_CASE(EEOP_ROWCOMPARE_FINAL)
{
int32 cmpresult = DatumGetInt32(*op->resvalue);
RowCompareType rctype = op->d.rowcompare_final.rctype;
*op->resnull = false;
switch (rctype)
{
/* EQ and NE cases aren't allowed here */
case ROWCOMPARE_LT:
*op->resvalue = BoolGetDatum(cmpresult < 0);
break;
case ROWCOMPARE_LE:
*op->resvalue = BoolGetDatum(cmpresult <= 0);
break;
case ROWCOMPARE_GE:
*op->resvalue = BoolGetDatum(cmpresult >= 0);
break;
case ROWCOMPARE_GT:
*op->resvalue = BoolGetDatum(cmpresult > 0);
break;
default:
Assert(false);
break;
}
EEO_NEXT();
}
EEO_CASE(EEOP_MINMAX)
{
/* too complex for an inline implementation */
ExecEvalMinMax(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_FIELDSELECT)
{
/* too complex for an inline implementation */
ExecEvalFieldSelect(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_FIELDSTORE_DEFORM)
{
/* too complex for an inline implementation */
ExecEvalFieldStoreDeForm(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_FIELDSTORE_FORM)
{
/* too complex for an inline implementation */
ExecEvalFieldStoreForm(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_SBSREF_SUBSCRIPT)
{
/* Process an array subscript */
/* too complex for an inline implementation */
if (ExecEvalSubscriptingRef(state, op))
{
EEO_NEXT();
}
else
{
/* Subscript is null, short-circuit SubscriptingRef to NULL */
EEO_JUMP(op->d.sbsref_subscript.jumpdone);
}
}
EEO_CASE(EEOP_SBSREF_OLD)
{
/*
* Fetch the old value in an sbsref assignment, in case it's
* referenced (via a CaseTestExpr) inside the assignment
* expression.
*/
/* too complex for an inline implementation */
ExecEvalSubscriptingRefOld(state, op);
EEO_NEXT();
}
/*
* Perform SubscriptingRef assignment
*/
EEO_CASE(EEOP_SBSREF_ASSIGN)
{
/* too complex for an inline implementation */
ExecEvalSubscriptingRefAssign(state, op);
EEO_NEXT();
}
/*
* Fetch subset of an array.
*/
EEO_CASE(EEOP_SBSREF_FETCH)
{
/* too complex for an inline implementation */
ExecEvalSubscriptingRefFetch(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_CONVERT_ROWTYPE)
{
/* too complex for an inline implementation */
ExecEvalConvertRowtype(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_SCALARARRAYOP)
{
/* too complex for an inline implementation */
ExecEvalScalarArrayOp(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_SCALARARRAYOP_FAST_INT)
{
/* too complex for an inline implementation */
ExecEvalScalarArrayOpFastInt(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_SCALARARRAYOP_FAST_STR)
{
/* too complex for an inline implementation */
ExecEvalScalarArrayOpFastStr(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_DOMAIN_NOTNULL)
{
/* too complex for an inline implementation */
ExecEvalConstraintNotNull(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_DOMAIN_CHECK)
{
/* too complex for an inline implementation */
ExecEvalConstraintCheck(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_XMLEXPR)
{
/* too complex for an inline implementation */
ExecEvalXmlExpr(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_AGGREF)
{
/*
* Returns a Datum whose value is the precomputed aggregate value
* found in the given expression context.
*/
AggrefExprState *aggref = op->d.aggref.astate;
Assert(econtext->ecxt_aggvalues != NULL);
*op->resvalue = econtext->ecxt_aggvalues[aggref->aggno];
*op->resnull = econtext->ecxt_aggnulls[aggref->aggno];
EEO_NEXT();
}
EEO_CASE(EEOP_GROUPING_FUNC)
{
/* too complex/uncommon for an inline implementation */
ExecEvalGroupingFunc(state, op);
EEO_NEXT();
}
EEO_CASE(EEOP_GROUP_ID)
{
int group_id = op->d.group_id.parent->group_id;
*op->resvalue = Int32GetDatum(group_id);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_GROUPING_SET_ID)
{
int gset_id = op->d.grouping_set_id.parent->gset_id;
*op->resvalue = Int32GetDatum(gset_id);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_AGGEXPR_ID)
{
int currentExprId = op->d.agg_expr_id.parent->currentExprId;
*op->resvalue = Int32GetDatum(currentExprId);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_ROWIDEXPR)
{
int64 rowcounter = ++op->d.rowidexpr.rowcounter;
*op->resvalue = Int64GetDatum(rowcounter);
*op->resnull = false;
EEO_NEXT();
}
EEO_CASE(EEOP_WINDOW_FUNC)
{
/*
* Like Aggref, just return a precomputed value from the econtext.
*/
WindowFuncExprState *wfunc = op->d.window_func.wfstate;
Assert(econtext->ecxt_aggvalues != NULL);
*op->resvalue = econtext->ecxt_aggvalues[wfunc->wfuncno];
*op->resnull = econtext->ecxt_aggnulls[wfunc->wfuncno];
EEO_NEXT();
}
EEO_CASE(EEOP_SUBPLAN)
{
/* too complex for an inline implementation */
ExecEvalSubPlan(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_ALTERNATIVE_SUBPLAN)
{
/* too complex for an inline implementation */
ExecEvalAlternativeSubPlan(state, op, econtext);
EEO_NEXT();
}
/* evaluate a strict aggregate deserialization function */
EEO_CASE(EEOP_AGG_STRICT_DESERIALIZE)
{
/* Don't call a strict deserialization function with NULL input */
if (op->d.agg_deserialize.fcinfo_data->args[0].isnull)
EEO_JUMP(op->d.agg_deserialize.jumpnull);
/* fallthrough */
}
/* evaluate aggregate deserialization function (non-strict portion) */
EEO_CASE(EEOP_AGG_DESERIALIZE)
{
FunctionCallInfo fcinfo = op->d.agg_deserialize.fcinfo_data;
AggState *aggstate = op->d.agg_deserialize.aggstate;
MemoryContext oldContext;
/*
* We run the deserialization functions in per-input-tuple memory
* context.
*/
oldContext = MemoryContextSwitchTo(aggstate->tmpcontext->ecxt_per_tuple_memory);
fcinfo->isnull = false;
*op->resvalue = FunctionCallInvoke(fcinfo);
*op->resnull = fcinfo->isnull;
MemoryContextSwitchTo(oldContext);
EEO_NEXT();
}
/*
* Check that a strict aggregate transition / combination function's
* input is not NULL.
*/
EEO_CASE(EEOP_AGG_STRICT_INPUT_CHECK_NULLS)
{
int argno;
bool *nulls = op->d.agg_strict_input_check.nulls;
int nargs = op->d.agg_strict_input_check.nargs;
for (argno = 0; argno < nargs; argno++)
{
if (nulls[argno])
EEO_JUMP(op->d.agg_strict_input_check.jumpnull);
}
EEO_NEXT();
}
EEO_CASE(EEOP_AGG_STRICT_INPUT_CHECK_ARGS)
{
int argno;
NullableDatum *args = op->d.agg_strict_input_check.args;
int nargs = op->d.agg_strict_input_check.nargs;
for (argno = 0; argno < nargs; argno++)
{
if (args[argno].isnull)
EEO_JUMP(op->d.agg_strict_input_check.jumpnull);
}
EEO_NEXT();
}
/*
* Check for a NULL pointer to the per-group states.
*/
EEO_CASE(EEOP_AGG_PLAIN_PERGROUP_NULLCHECK)
{
AggState *aggstate = castNode(AggState, state->parent);
AggStatePerGroup pergroup_allaggs = aggstate->all_pergroups
[op->d.agg_plain_pergroup_nullcheck.setoff];
if (pergroup_allaggs == NULL)
EEO_JUMP(op->d.agg_plain_pergroup_nullcheck.jumpnull);
EEO_NEXT();
}
/*
* Different types of aggregate transition functions are implemented
* as different types of steps, to avoid incurring unnecessary
* overhead. There's a step type for each valid combination of having
* a by value / by reference transition type, [not] needing to the
* initialize the transition value for the first row in a group from
* input, and [not] strict transition function.
*
* Could optimize further by splitting off by-reference for
* fixed-length types, but currently that doesn't seem worth it.
*/
EEO_CASE(EEOP_AGG_INIT_TRANS)
{
AggState *aggstate;
AggStatePerGroup pergroup;
aggstate = op->d.agg_init_trans.aggstate;
pergroup = &aggstate->all_pergroups
[op->d.agg_init_trans.setoff]
[op->d.agg_init_trans.transno];
/* If transValue has not yet been initialized, do so now. */
if (pergroup->noTransValue)
{
AggStatePerTrans pertrans = op->d.agg_init_trans.pertrans;
aggstate->curaggcontext = op->d.agg_init_trans.aggcontext;
aggstate->current_set = op->d.agg_init_trans.setno;
ExecAggInitGroup(aggstate, pertrans, pergroup);
/* copied trans value from input, done this round */
EEO_JUMP(op->d.agg_init_trans.jumpnull);
}
EEO_NEXT();
}
/* check that a strict aggregate's input isn't NULL */
EEO_CASE(EEOP_AGG_STRICT_TRANS_CHECK)
{
AggState *aggstate;
AggStatePerGroup pergroup;
aggstate = op->d.agg_strict_trans_check.aggstate;
pergroup = &aggstate->all_pergroups
[op->d.agg_strict_trans_check.setoff]
[op->d.agg_strict_trans_check.transno];
if (unlikely(pergroup->transValueIsNull))
EEO_JUMP(op->d.agg_strict_trans_check.jumpnull);
EEO_NEXT();
}
/*
* Evaluate aggregate transition / combine function that has a
* by-value transition type. That's a separate case from the
* by-reference implementation because it's a bit simpler.
*/
EEO_CASE(EEOP_AGG_PLAIN_TRANS_BYVAL)
{
AggState *aggstate;
AggStatePerTrans pertrans;
AggStatePerGroup pergroup;
FunctionCallInfo fcinfo;
MemoryContext oldContext;
Datum newVal;
aggstate = op->d.agg_trans.aggstate;
pertrans = op->d.agg_trans.pertrans;
pergroup = &aggstate->all_pergroups
[op->d.agg_trans.setoff]
[op->d.agg_trans.transno];
Assert(pertrans->transtypeByVal);
fcinfo = pertrans->transfn_fcinfo;
/* cf. select_current_set() */
aggstate->curaggcontext = op->d.agg_trans.aggcontext;
aggstate->current_set = op->d.agg_trans.setno;
/* set up aggstate->curpertrans for AggGetAggref() */
aggstate->curpertrans = pertrans;
/* invoke transition function in per-tuple context */
oldContext = MemoryContextSwitchTo(aggstate->tmpcontext->ecxt_per_tuple_memory);
fcinfo->args[0].value = pergroup->transValue;
fcinfo->args[0].isnull = pergroup->transValueIsNull;
fcinfo->isnull = false; /* just in case transfn doesn't set it */
newVal = FunctionCallInvoke(fcinfo);
pergroup->transValue = newVal;
pergroup->transValueIsNull = fcinfo->isnull;
MemoryContextSwitchTo(oldContext);
EEO_NEXT();
}
/*
* Evaluate aggregate transition / combine function that has a
* by-reference transition type.
*
* Could optimize a bit further by splitting off by-reference
* fixed-length types, but currently that doesn't seem worth it.
*/
EEO_CASE(EEOP_AGG_PLAIN_TRANS)
{
AggState *aggstate;
AggStatePerTrans pertrans;
AggStatePerGroup pergroup;
FunctionCallInfo fcinfo;
MemoryContext oldContext;
Datum newVal;
aggstate = op->d.agg_trans.aggstate;
pertrans = op->d.agg_trans.pertrans;
pergroup = &aggstate->all_pergroups
[op->d.agg_trans.setoff]
[op->d.agg_trans.transno];
Assert(!pertrans->transtypeByVal);
fcinfo = pertrans->transfn_fcinfo;
/* cf. select_current_set() */
aggstate->curaggcontext = op->d.agg_trans.aggcontext;
aggstate->current_set = op->d.agg_trans.setno;
/* set up aggstate->curpertrans for AggGetAggref() */
aggstate->curpertrans = pertrans;
/* invoke transition function in per-tuple context */
oldContext = MemoryContextSwitchTo(aggstate->tmpcontext->ecxt_per_tuple_memory);
fcinfo->args[0].value = pergroup->transValue;
fcinfo->args[0].isnull = pergroup->transValueIsNull;
fcinfo->isnull = false; /* just in case transfn doesn't set it */
newVal = FunctionCallInvoke(fcinfo);
/*
* For pass-by-ref datatype, must copy the new value into
* aggcontext and free the prior transValue. But if transfn
* returned a pointer to its first input, we don't need to do
* anything. Also, if transfn returned a pointer to a R/W
* expanded object that is already a child of the aggcontext,
* assume we can adopt that value without copying it.
*
* It's safe to compare newVal with pergroup->transValue without
* regard for either being NULL, because ExecAggTransReparent()
* takes care to set transValue to 0 when NULL. Otherwise we could
* end up accidentally not reparenting, when the transValue has
* the same numerical value as newValue, despite being NULL. This
* is a somewhat hot path, making it undesirable to instead solve
* this with another branch for the common case of the transition
* function returning its (modified) input argument.
*/
if (DatumGetPointer(newVal) != DatumGetPointer(pergroup->transValue))
newVal = ExecAggTransReparent(aggstate, pertrans,
newVal, fcinfo->isnull,
pergroup->transValue,
pergroup->transValueIsNull);
pergroup->transValue = newVal;
pergroup->transValueIsNull = fcinfo->isnull;
MemoryContextSwitchTo(oldContext);
EEO_NEXT();
}
/* process single-column ordered aggregate datum */
EEO_CASE(EEOP_AGG_ORDERED_TRANS_DATUM)
{
/* too complex for an inline implementation */
ExecEvalAggOrderedTransDatum(state, op, econtext);
EEO_NEXT();
}
/* process multi-column ordered aggregate tuple */
EEO_CASE(EEOP_AGG_ORDERED_TRANS_TUPLE)
{
/* too complex for an inline implementation */
ExecEvalAggOrderedTransTuple(state, op, econtext);
EEO_NEXT();
}
EEO_CASE(EEOP_LAST)
{
/* unreachable */
Assert(false);
goto out;
}
}
out:
*isnull = state->resnull;
return state->resvalue;
}
/*
* Expression evaluation callback that performs extra checks before executing
* the expression. Declared extern so other methods of execution can use it
* too.
*/
Datum
ExecInterpExprStillValid(ExprState *state, ExprContext *econtext, bool *isNull)
{
/*
* First time through, check whether attribute matches Var. Might not be
* ok anymore, due to schema changes.
*/
CheckExprStillValid(state, econtext);
/* skip the check during further executions */
state->evalfunc = (ExprStateEvalFunc) state->evalfunc_private;
/* and actually execute */
return state->evalfunc(state, econtext, isNull);
}
/*
* Check that an expression is still valid in the face of potential schema
* changes since the plan has been created.
*/
void
CheckExprStillValid(ExprState *state, ExprContext *econtext)
{
int i = 0;
TupleTableSlot *innerslot;
TupleTableSlot *outerslot;
TupleTableSlot *scanslot;
innerslot = econtext->ecxt_innertuple;
outerslot = econtext->ecxt_outertuple;
scanslot = econtext->ecxt_scantuple;
for (i = 0; i < state->steps_len; i++)
{
ExprEvalStep *op = &state->steps[i];
switch (ExecEvalStepOp(state, op))
{
case EEOP_INNER_VAR:
{
int attnum = op->d.var.attnum;
CheckVarSlotCompatibility(innerslot, attnum + 1, op->d.var.vartype);
break;
}
case EEOP_OUTER_VAR:
{
int attnum = op->d.var.attnum;
CheckVarSlotCompatibility(outerslot, attnum + 1, op->d.var.vartype);
break;
}
case EEOP_SCAN_VAR:
{
int attnum = op->d.var.attnum;
CheckVarSlotCompatibility(scanslot, attnum + 1, op->d.var.vartype);
break;
}
default:
break;
}
}
}
/*
* Check whether a user attribute in a slot can be referenced by a Var
* expression. This should succeed unless there have been schema changes
* since the expression tree has been created.
*/
static void
CheckVarSlotCompatibility(TupleTableSlot *slot, int attnum, Oid vartype)
{
/*
* What we have to check for here is the possibility of an attribute
* having been dropped or changed in type since the plan tree was created.
* Ideally the plan will get invalidated and not re-used, but just in
* case, we keep these defenses. Fortunately it's sufficient to check
* once on the first time through.
*
* Note: ideally we'd check typmod as well as typid, but that seems
* impractical at the moment: in many cases the tupdesc will have been
* generated by ExecTypeFromTL(), and that can't guarantee to generate an
* accurate typmod in all cases, because some expression node types don't
* carry typmod. Fortunately, for precisely that reason, there should be
* no places with a critical dependency on the typmod of a value.
*
* System attributes don't require checking since their types never
* change.
*/
if (attnum > 0)
{
TupleDesc slot_tupdesc = slot->tts_tupleDescriptor;
Form_pg_attribute attr;
if (attnum > slot_tupdesc->natts) /* should never happen */
elog(ERROR, "attribute number %d exceeds number of columns %d",
attnum, slot_tupdesc->natts);
attr = TupleDescAttr(slot_tupdesc, attnum - 1);
if (attr->attisdropped)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("attribute %d of type %s has been dropped",
attnum, format_type_be(slot_tupdesc->tdtypeid))));
if (vartype != attr->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("attribute %d of type %s has wrong type",
attnum, format_type_be(slot_tupdesc->tdtypeid)),
errdetail("Table has type %s, but query expects %s.",
format_type_be(attr->atttypid),
format_type_be(vartype))));
}
}
/*
* Verify that the slot is compatible with a EEOP_*_FETCHSOME operation.
*/
static void
CheckOpSlotCompatibility(ExprEvalStep *op, TupleTableSlot *slot)
{
#ifdef USE_ASSERT_CHECKING
/* there's nothing to check */
if (!op->d.fetch.fixed)
return;
/*
* Should probably fixed at some point, but for now it's easier to allow
* buffer and heap tuples to be used interchangeably.
*/
if (slot->tts_ops == &TTSOpsBufferHeapTuple &&
op->d.fetch.kind == &TTSOpsHeapTuple)
return;
if (slot->tts_ops == &TTSOpsHeapTuple &&
op->d.fetch.kind == &TTSOpsBufferHeapTuple)
return;
/*
* At the moment we consider it OK if a virtual slot is used instead of a
* specific type of slot, as a virtual slot never needs to be deformed.
*/
if (slot->tts_ops == &TTSOpsVirtual)
return;
/*
* We think it is OK if op's fetch kind is virtual.
*/
if (op->d.fetch.kind == &TTSOpsVirtual)
return;
// FIXME: A simple explain select * from foo join bar on foo.a=bar.b; where
// bar is a PT on the outer side of a HJ triggers this assert without the above
// if statement
Assert(op->d.fetch.kind == slot->tts_ops);
#endif
}
/*
* get_cached_rowtype: utility function to lookup a rowtype tupdesc
*
* type_id, typmod: identity of the rowtype
* cache_field: where to cache the TupleDesc pointer in expression state node
* (field must be initialized to NULL)
* econtext: expression context we are executing in
*
* NOTE: because the shutdown callback will be called during plan rescan,
* must be prepared to re-do this during any node execution; cannot call
* just once during expression initialization.
*/
static TupleDesc
get_cached_rowtype(Oid type_id, int32 typmod,
TupleDesc *cache_field, ExprContext *econtext)
{
TupleDesc tupDesc = *cache_field;
/* Do lookup if no cached value or if requested type changed */
if (tupDesc == NULL ||
type_id != tupDesc->tdtypeid ||
typmod != tupDesc->tdtypmod)
{
tupDesc = lookup_rowtype_tupdesc(type_id, typmod);
if (*cache_field)
{
/* Release old tupdesc; but callback is already registered */
ReleaseTupleDesc(*cache_field);
}
else
{
/* Need to register shutdown callback to release tupdesc */
RegisterExprContextCallback(econtext,
ShutdownTupleDescRef,
PointerGetDatum(cache_field));
}
*cache_field = tupDesc;
}
return tupDesc;
}
/*
* Callback function to release a tupdesc refcount at econtext shutdown
*/
static void
ShutdownTupleDescRef(Datum arg)
{
TupleDesc *cache_field = (TupleDesc *) DatumGetPointer(arg);
if (*cache_field)
ReleaseTupleDesc(*cache_field);
*cache_field = NULL;
}
/*
* Fast-path functions, for very simple expressions
*/
/* Simple reference to inner Var */
static Datum
ExecJustInnerVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.var.attnum + 1;
TupleTableSlot *slot = econtext->ecxt_innertuple;
CheckOpSlotCompatibility(&state->steps[0], slot);
/*
* Since we use slot_getattr(), we don't need to implement the FETCHSOME
* step explicitly, and we also needn't Assert that the attnum is in range
* --- slot_getattr() will take care of any problems.
*/
return slot_getattr(slot, attnum, isnull);
}
/* Simple reference to outer Var */
static Datum
ExecJustOuterVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.var.attnum + 1;
TupleTableSlot *slot = econtext->ecxt_outertuple;
CheckOpSlotCompatibility(&state->steps[0], slot);
/* See comments in ExecJustInnerVar */
return slot_getattr(slot, attnum, isnull);
}
/* Simple reference to scan Var */
static Datum
ExecJustScanVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.var.attnum + 1;
TupleTableSlot *slot = econtext->ecxt_scantuple;
CheckOpSlotCompatibility(&state->steps[0], slot);
/* See comments in ExecJustInnerVar */
return slot_getattr(slot, attnum, isnull);
}
/* Simple Const expression */
static Datum
ExecJustConst(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[0];
*isnull = op->d.constval.isnull;
return op->d.constval.value;
}
/* Evaluate inner Var and assign to appropriate column of result tuple */
static Datum
ExecJustAssignInnerVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.assign_var.attnum + 1;
int resultnum = op->d.assign_var.resultnum;
TupleTableSlot *inslot = econtext->ecxt_innertuple;
TupleTableSlot *outslot = state->resultslot;
CheckOpSlotCompatibility(&state->steps[0], inslot);
/*
* We do not need CheckVarSlotCompatibility here; that was taken care of
* at compilation time.
*
* Since we use slot_getattr(), we don't need to implement the FETCHSOME
* step explicitly, and we also needn't Assert that the attnum is in range
* --- slot_getattr() will take care of any problems.
*/
outslot->tts_values[resultnum] =
slot_getattr(inslot, attnum, &outslot->tts_isnull[resultnum]);
return 0;
}
/* Evaluate outer Var and assign to appropriate column of result tuple */
static Datum
ExecJustAssignOuterVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.assign_var.attnum + 1;
int resultnum = op->d.assign_var.resultnum;
TupleTableSlot *inslot = econtext->ecxt_outertuple;
TupleTableSlot *outslot = state->resultslot;
CheckOpSlotCompatibility(&state->steps[0], inslot);
/* See comments in ExecJustAssignInnerVar */
outslot->tts_values[resultnum] =
slot_getattr(inslot, attnum, &outslot->tts_isnull[resultnum]);
return 0;
}
/* Evaluate scan Var and assign to appropriate column of result tuple */
static Datum
ExecJustAssignScanVar(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[1];
int attnum = op->d.assign_var.attnum + 1;
int resultnum = op->d.assign_var.resultnum;
TupleTableSlot *inslot = econtext->ecxt_scantuple;
TupleTableSlot *outslot = state->resultslot;
CheckOpSlotCompatibility(&state->steps[0], inslot);
/* See comments in ExecJustAssignInnerVar */
outslot->tts_values[resultnum] =
slot_getattr(inslot, attnum, &outslot->tts_isnull[resultnum]);
return 0;
}
/* Evaluate CASE_TESTVAL and apply a strict function to it */
static Datum
ExecJustApplyFuncToCase(ExprState *state, ExprContext *econtext, bool *isnull)
{
ExprEvalStep *op = &state->steps[0];
FunctionCallInfo fcinfo;
NullableDatum *args;
int argno;
Datum d;
/*
* XXX with some redesign of the CaseTestExpr mechanism, maybe we could
* get rid of this data shuffling?
*/
*op->resvalue = *op->d.casetest.value;
*op->resnull = *op->d.casetest.isnull;
op++;
fcinfo = op->d.func.fcinfo_data;
args = fcinfo->args;
/* strict function, so check for NULL args */
for (argno = 0; argno < op->d.func.nargs; argno++)
{
if (args[argno].isnull)
{
*isnull = true;
return (Datum) 0;
}
}
fcinfo->isnull = false;
d = op->d.func.fn_addr(fcinfo);
*isnull = fcinfo->isnull;
return d;
}
#if defined(EEO_USE_COMPUTED_GOTO)
/*
* Comparator used when building address->opcode lookup table for
* ExecEvalStepOp() in the threaded dispatch case.
*/
static int
dispatch_compare_ptr(const void *a, const void *b)
{
const ExprEvalOpLookup *la = (const ExprEvalOpLookup *) a;
const ExprEvalOpLookup *lb = (const ExprEvalOpLookup *) b;
if (la->opcode < lb->opcode)
return -1;
else if (la->opcode > lb->opcode)
return 1;
return 0;
}
#endif
/*
* Do one-time initialization of interpretation machinery.
*/
static void
ExecInitInterpreter(void)
{
#if defined(EEO_USE_COMPUTED_GOTO)
/* Set up externally-visible pointer to dispatch table */
if (dispatch_table == NULL)
{
int i;
dispatch_table = (const void **)
DatumGetPointer(ExecInterpExpr(NULL, NULL, NULL));
/* build reverse lookup table */
for (i = 0; i < EEOP_LAST; i++)
{
reverse_dispatch_table[i].opcode = dispatch_table[i];
reverse_dispatch_table[i].op = (ExprEvalOp) i;
}
/* make it bsearch()able */
qsort(reverse_dispatch_table,
EEOP_LAST /* nmembers */ ,
sizeof(ExprEvalOpLookup),
dispatch_compare_ptr);
}
#endif
}
/*
* Function to return the opcode of an expression step.
*
* When direct-threading is in use, ExprState->opcode isn't easily
* decipherable. This function returns the appropriate enum member.
*/
ExprEvalOp
ExecEvalStepOp(ExprState *state, ExprEvalStep *op)
{
#if defined(EEO_USE_COMPUTED_GOTO)
if (state->flags & EEO_FLAG_DIRECT_THREADED)
{
ExprEvalOpLookup key;
ExprEvalOpLookup *res;
key.opcode = (void *) op->opcode;
res = bsearch(&key,
reverse_dispatch_table,
EEOP_LAST /* nmembers */ ,
sizeof(ExprEvalOpLookup),
dispatch_compare_ptr);
Assert(res); /* unknown ops shouldn't get looked up */
return res->op;
}
#endif
return (ExprEvalOp) op->opcode;
}
/*
* Out-of-line helper functions for complex instructions.
*/
/*
* Evaluate EEOP_FUNCEXPR_FUSAGE
*/
void
ExecEvalFuncExprFusage(ExprState *state, ExprEvalStep *op,
ExprContext *econtext)
{
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
PgStat_FunctionCallUsage fcusage;
Datum d;
pgstat_init_function_usage(fcinfo, &fcusage);
fcinfo->isnull = false;
d = op->d.func.fn_addr(fcinfo);
*op->resvalue = d;
*op->resnull = fcinfo->isnull;
pgstat_end_function_usage(&fcusage, true);
}
/*
* Evaluate EEOP_FUNCEXPR_STRICT_FUSAGE
*/
void
ExecEvalFuncExprStrictFusage(ExprState *state, ExprEvalStep *op,
ExprContext *econtext)
{
FunctionCallInfo fcinfo = op->d.func.fcinfo_data;
PgStat_FunctionCallUsage fcusage;
NullableDatum *args = fcinfo->args;
int argno;
Datum d;
/* strict function, so check for NULL args */
for (argno = 0; argno < op->d.func.nargs; argno++)
{
if (args[argno].isnull)
{
*op->resnull = true;
return;
}
}
pgstat_init_function_usage(fcinfo, &fcusage);
fcinfo->isnull = false;
d = op->d.func.fn_addr(fcinfo);
*op->resvalue = d;
*op->resnull = fcinfo->isnull;
pgstat_end_function_usage(&fcusage, true);
}
/*
* Evaluate a PARAM_EXEC parameter.
*
* PARAM_EXEC params (internal executor parameters) are stored in the
* ecxt_param_exec_vals array, and can be accessed by array index.
*/
void
ExecEvalParamExec(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
ParamExecData *prm;
prm = &(econtext->ecxt_param_exec_vals[op->d.param.paramid]);
if (unlikely(prm->execPlan != NULL))
{
/* Parameter not evaluated yet, so go do it */
ExecSetParamPlan(prm->execPlan, econtext, NULL);
/* ExecSetParamPlan should have processed this param... */
Assert(prm->execPlan == NULL);
}
*op->resvalue = prm->value;
*op->resnull = prm->isnull;
}
/*
* Evaluate a PARAM_EXTERN parameter.
*
* PARAM_EXTERN parameters must be sought in ecxt_param_list_info.
*/
void
ExecEvalParamExtern(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
ParamListInfo paramInfo = econtext->ecxt_param_list_info;
int paramId = op->d.param.paramid;
if (likely(paramInfo &&
paramId > 0 && paramId <= paramInfo->numParams))
{
ParamExternData *prm;
ParamExternData prmdata;
/* give hook a chance in case parameter is dynamic */
if (paramInfo->paramFetch != NULL)
prm = paramInfo->paramFetch(paramInfo, paramId, false, &prmdata);
else
prm = ¶mInfo->params[paramId - 1];
if (likely(OidIsValid(prm->ptype)))
{
/* safety check in case hook did something unexpected */
if (unlikely(prm->ptype != op->d.param.paramtype))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("type of parameter %d (%s) does not match that when preparing the plan (%s)",
paramId,
format_type_be(prm->ptype),
format_type_be(op->d.param.paramtype))));
*op->resvalue = prm->value;
*op->resnull = prm->isnull;
return;
}
}
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("no value found for parameter %d", paramId)));
}
/*
* Evaluate a SQLValueFunction expression.
*/
void
ExecEvalSQLValueFunction(ExprState *state, ExprEvalStep *op)
{
LOCAL_FCINFO(fcinfo, 0);
SQLValueFunction *svf = op->d.sqlvaluefunction.svf;
*op->resnull = false;
/*
* Note: current_schema() can return NULL. current_user() etc currently
* cannot, but might as well code those cases the same way for safety.
*/
switch (svf->op)
{
case SVFOP_CURRENT_DATE:
*op->resvalue = DateADTGetDatum(GetSQLCurrentDate());
break;
case SVFOP_CURRENT_TIME:
case SVFOP_CURRENT_TIME_N:
*op->resvalue = TimeTzADTPGetDatum(GetSQLCurrentTime(svf->typmod));
break;
case SVFOP_CURRENT_TIMESTAMP:
case SVFOP_CURRENT_TIMESTAMP_N:
*op->resvalue = TimestampTzGetDatum(GetSQLCurrentTimestamp(svf->typmod));
break;
case SVFOP_LOCALTIME:
case SVFOP_LOCALTIME_N:
*op->resvalue = TimeADTGetDatum(GetSQLLocalTime(svf->typmod));
break;
case SVFOP_LOCALTIMESTAMP:
case SVFOP_LOCALTIMESTAMP_N:
*op->resvalue = TimestampGetDatum(GetSQLLocalTimestamp(svf->typmod));
break;
case SVFOP_CURRENT_ROLE:
case SVFOP_CURRENT_USER:
case SVFOP_USER:
InitFunctionCallInfoData(*fcinfo, NULL, 0, InvalidOid, NULL, NULL);
*op->resvalue = current_user(fcinfo);
*op->resnull = fcinfo->isnull;
break;
case SVFOP_SESSION_USER:
InitFunctionCallInfoData(*fcinfo, NULL, 0, InvalidOid, NULL, NULL);
*op->resvalue = session_user(fcinfo);
*op->resnull = fcinfo->isnull;
break;
case SVFOP_CURRENT_CATALOG:
InitFunctionCallInfoData(*fcinfo, NULL, 0, InvalidOid, NULL, NULL);
*op->resvalue = current_database(fcinfo);
*op->resnull = fcinfo->isnull;
break;
case SVFOP_CURRENT_SCHEMA:
InitFunctionCallInfoData(*fcinfo, NULL, 0, InvalidOid, NULL, NULL);
*op->resvalue = current_schema(fcinfo);
*op->resnull = fcinfo->isnull;
break;
}
}
/*
* Raise error if a CURRENT OF expression is evaluated.
*
* GPDB:
* Constant folding must have bound observed values of gp_segment_id,
* ctid, and tableoid into the CurrentOfExpr for this function's
* consumption.
*/
void
ExecEvalCurrentOfExpr(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
CurrentOfExpr *cexpr = (CurrentOfExpr *) state->expr;
bool result = false;
TupleTableSlot *slot;
Assert(cexpr->cvarno != INNER_VAR);
Assert(cexpr->cvarno != OUTER_VAR);
slot = econtext->ecxt_scantuple;
Assert(!TupIsNull(slot));
/*
* The currently scanned tuple must use heap storage for it to possibly
* satisfy the CURRENT OF qualification. Despite our grand attempts during
* parsing and constant folding to demand heap storage, the scanning of an
* AO part is still possible, when the current row uses heap storage, but the
* CURRENT OF invocation uses an unpruned scan of the partition table, yielding
* tuples from the AO parts before the desired heap tuple.
*/
if (slot->tts_ops == &TTSOpsHeapTuple ||
slot->tts_ops == &TTSOpsBufferHeapTuple)
{
ItemPointerData cursor_tid;
if (execCurrentOf(cexpr, econtext,
slot->tts_tableOid,
&cursor_tid))
{
if (ItemPointerEquals(&cursor_tid, &slot->tts_tid))
result = true;
}
}
*op->resvalue = result;
*op->resnull = false;
}
/*
* Evaluate NextValueExpr.
*/
void
ExecEvalNextValueExpr(ExprState *state, ExprEvalStep *op)
{
int64 newval = nextval_internal(op->d.nextvalueexpr.seqid, false, Gp_role == GP_ROLE_DISPATCH);
switch (op->d.nextvalueexpr.seqtypid)
{
case INT2OID:
*op->resvalue = Int16GetDatum((int16) newval);
break;
case INT4OID:
*op->resvalue = Int32GetDatum((int32) newval);
break;
case INT8OID:
*op->resvalue = Int64GetDatum((int64) newval);
break;
default:
elog(ERROR, "unsupported sequence type %u",
op->d.nextvalueexpr.seqtypid);
}
*op->resnull = false;
}
/*
* Evaluate NullTest / IS NULL for rows.
*/
void
ExecEvalRowNull(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
ExecEvalRowNullInt(state, op, econtext, true);
}
/*
* Evaluate NullTest / IS NOT NULL for rows.
*/
void
ExecEvalRowNotNull(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
ExecEvalRowNullInt(state, op, econtext, false);
}
/* Common code for IS [NOT] NULL on a row value */
static void
ExecEvalRowNullInt(ExprState *state, ExprEvalStep *op,
ExprContext *econtext, bool checkisnull)
{
Datum value = *op->resvalue;
bool isnull = *op->resnull;
HeapTupleHeader tuple;
Oid tupType;
int32 tupTypmod;
TupleDesc tupDesc;
HeapTupleData tmptup;
int att;
*op->resnull = false;
/* NULL row variables are treated just as NULL scalar columns */
if (isnull)
{
*op->resvalue = BoolGetDatum(checkisnull);
return;
}
/*
* The SQL standard defines IS [NOT] NULL for a non-null rowtype argument
* as:
*
* "R IS NULL" is true if every field is the null value.
*
* "R IS NOT NULL" is true if no field is the null value.
*
* This definition is (apparently intentionally) not recursive; so our
* tests on the fields are primitive attisnull tests, not recursive checks
* to see if they are all-nulls or no-nulls rowtypes.
*
* The standard does not consider the possibility of zero-field rows, but
* here we consider them to vacuously satisfy both predicates.
*/
tuple = DatumGetHeapTupleHeader(value);
tupType = HeapTupleHeaderGetTypeId(tuple);
tupTypmod = HeapTupleHeaderGetTypMod(tuple);
/* Lookup tupdesc if first time through or if type changes */
tupDesc = get_cached_rowtype(tupType, tupTypmod,
&op->d.nulltest_row.argdesc,
econtext);
/*
* heap_attisnull needs a HeapTuple not a bare HeapTupleHeader.
*/
tmptup.t_len = HeapTupleHeaderGetDatumLength(tuple);
tmptup.t_data = tuple;
for (att = 1; att <= tupDesc->natts; att++)
{
/* ignore dropped columns */
if (TupleDescAttr(tupDesc, att - 1)->attisdropped)
continue;
if (heap_attisnull(&tmptup, att, tupDesc))
{
/* null field disproves IS NOT NULL */
if (!checkisnull)
{
*op->resvalue = BoolGetDatum(false);
return;
}
}
else
{
/* non-null field disproves IS NULL */
if (checkisnull)
{
*op->resvalue = BoolGetDatum(false);
return;
}
}
}
*op->resvalue = BoolGetDatum(true);
}
/*
* Evaluate an ARRAY[] expression.
*
* The individual array elements (or subarrays) have already been evaluated
* into op->d.arrayexpr.elemvalues[]/elemnulls[].
*/
void
ExecEvalArrayExpr(ExprState *state, ExprEvalStep *op)
{
ArrayType *result;
Oid element_type = op->d.arrayexpr.elemtype;
int nelems = op->d.arrayexpr.nelems;
int ndims = 0;
int dims[MAXDIM];
int lbs[MAXDIM];
/* Set non-null as default */
*op->resnull = false;
if (!op->d.arrayexpr.multidims)
{
/* Elements are presumably of scalar type */
Datum *dvalues = op->d.arrayexpr.elemvalues;
bool *dnulls = op->d.arrayexpr.elemnulls;
/* setup for 1-D array of the given length */
ndims = 1;
dims[0] = nelems;
lbs[0] = 1;
result = construct_md_array(dvalues, dnulls, ndims, dims, lbs,
element_type,
op->d.arrayexpr.elemlength,
op->d.arrayexpr.elembyval,
op->d.arrayexpr.elemalign);
}
else
{
/* Must be nested array expressions */
int nbytes = 0;
int nitems = 0;
int outer_nelems = 0;
int elem_ndims = 0;
int *elem_dims = NULL;
int *elem_lbs = NULL;
bool firstone = true;
bool havenulls = false;
bool haveempty = false;
char **subdata;
bits8 **subbitmaps;
int *subbytes;
int *subnitems;
int32 dataoffset;
char *dat;
int iitem;
int elemoff;
int i;
subdata = (char **) palloc(nelems * sizeof(char *));
subbitmaps = (bits8 **) palloc(nelems * sizeof(bits8 *));
subbytes = (int *) palloc(nelems * sizeof(int));
subnitems = (int *) palloc(nelems * sizeof(int));
/* loop through and get data area from each element */
for (elemoff = 0; elemoff < nelems; elemoff++)
{
Datum arraydatum;
bool eisnull;
ArrayType *array;
int this_ndims;
arraydatum = op->d.arrayexpr.elemvalues[elemoff];
eisnull = op->d.arrayexpr.elemnulls[elemoff];
/* temporarily ignore null subarrays */
if (eisnull)
{
haveempty = true;
continue;
}
array = DatumGetArrayTypeP(arraydatum);
/* run-time double-check on element type */
if (element_type != ARR_ELEMTYPE(array))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot merge incompatible arrays"),
errdetail("Array with element type %s cannot be "
"included in ARRAY construct with element type %s.",
format_type_be(ARR_ELEMTYPE(array)),
format_type_be(element_type))));
this_ndims = ARR_NDIM(array);
/* temporarily ignore zero-dimensional subarrays */
if (this_ndims <= 0)
{
haveempty = true;
continue;
}
if (firstone)
{
/* Get sub-array details from first member */
elem_ndims = this_ndims;
ndims = elem_ndims + 1;
if (ndims <= 0 || ndims > MAXDIM)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of array dimensions (%d) exceeds " \
"the maximum allowed (%d)", ndims, MAXDIM)));
elem_dims = (int *) palloc(elem_ndims * sizeof(int));
memcpy(elem_dims, ARR_DIMS(array), elem_ndims * sizeof(int));
elem_lbs = (int *) palloc(elem_ndims * sizeof(int));
memcpy(elem_lbs, ARR_LBOUND(array), elem_ndims * sizeof(int));
firstone = false;
}
else
{
/* Check other sub-arrays are compatible */
if (elem_ndims != this_ndims ||
memcmp(elem_dims, ARR_DIMS(array),
elem_ndims * sizeof(int)) != 0 ||
memcmp(elem_lbs, ARR_LBOUND(array),
elem_ndims * sizeof(int)) != 0)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("multidimensional arrays must have array "
"expressions with matching dimensions")));
}
subdata[outer_nelems] = ARR_DATA_PTR(array);
subbitmaps[outer_nelems] = ARR_NULLBITMAP(array);
subbytes[outer_nelems] = ARR_SIZE(array) - ARR_DATA_OFFSET(array);
nbytes += subbytes[outer_nelems];
subnitems[outer_nelems] = ArrayGetNItems(this_ndims,
ARR_DIMS(array));
nitems += subnitems[outer_nelems];
havenulls |= ARR_HASNULL(array);
outer_nelems++;
}
/*
* If all items were null or empty arrays, return an empty array;
* otherwise, if some were and some weren't, raise error. (Note: we
* must special-case this somehow to avoid trying to generate a 1-D
* array formed from empty arrays. It's not ideal...)
*/
if (haveempty)
{
if (ndims == 0) /* didn't find any nonempty array */
{
*op->resvalue = PointerGetDatum(construct_empty_array(element_type));
return;
}
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("multidimensional arrays must have array "
"expressions with matching dimensions")));
}
/* setup for multi-D array */
dims[0] = outer_nelems;
lbs[0] = 1;
for (i = 1; i < ndims; i++)
{
dims[i] = elem_dims[i - 1];
lbs[i] = elem_lbs[i - 1];
}
if (havenulls)
{
dataoffset = ARR_OVERHEAD_WITHNULLS(ndims, nitems);
nbytes += dataoffset;
}
else
{
dataoffset = 0; /* marker for no null bitmap */
nbytes += ARR_OVERHEAD_NONULLS(ndims);
}
result = (ArrayType *) palloc(nbytes);
SET_VARSIZE(result, nbytes);
result->ndim = ndims;
result->dataoffset = dataoffset;
result->elemtype = element_type;
memcpy(ARR_DIMS(result), dims, ndims * sizeof(int));
memcpy(ARR_LBOUND(result), lbs, ndims * sizeof(int));
dat = ARR_DATA_PTR(result);
iitem = 0;
for (i = 0; i < outer_nelems; i++)
{
memcpy(dat, subdata[i], subbytes[i]);
dat += subbytes[i];
if (havenulls)
array_bitmap_copy(ARR_NULLBITMAP(result), iitem,
subbitmaps[i], 0,
subnitems[i]);
iitem += subnitems[i];
}
}
*op->resvalue = PointerGetDatum(result);
}
/*
* Evaluate an ArrayCoerceExpr expression.
*
* Source array is in step's result variable.
*/
void
ExecEvalArrayCoerce(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
Datum arraydatum;
/* NULL array -> NULL result */
if (*op->resnull)
return;
arraydatum = *op->resvalue;
/*
* If it's binary-compatible, modify the element type in the array header,
* but otherwise leave the array as we received it.
*/
if (op->d.arraycoerce.elemexprstate == NULL)
{
/* Detoast input array if necessary, and copy in any case */
ArrayType *array = DatumGetArrayTypePCopy(arraydatum);
ARR_ELEMTYPE(array) = op->d.arraycoerce.resultelemtype;
*op->resvalue = PointerGetDatum(array);
return;
}
/*
* Use array_map to apply the sub-expression to each array element.
*/
*op->resvalue = array_map(arraydatum,
op->d.arraycoerce.elemexprstate,
econtext,
op->d.arraycoerce.resultelemtype,
op->d.arraycoerce.amstate);
}
/*
* Evaluate a ROW() expression.
*
* The individual columns have already been evaluated into
* op->d.row.elemvalues[]/elemnulls[].
*/
void
ExecEvalRow(ExprState *state, ExprEvalStep *op)
{
HeapTuple tuple;
/* build tuple from evaluated field values */
tuple = heap_form_tuple(op->d.row.tupdesc,
op->d.row.elemvalues,
op->d.row.elemnulls);
*op->resvalue = HeapTupleGetDatum(tuple);
*op->resnull = false;
}
/*
* Evaluate GREATEST() or LEAST() expression (note this is *not* MIN()/MAX()).
*
* All of the to-be-compared expressions have already been evaluated into
* op->d.minmax.values[]/nulls[].
*/
void
ExecEvalMinMax(ExprState *state, ExprEvalStep *op)
{
Datum *values = op->d.minmax.values;
bool *nulls = op->d.minmax.nulls;
FunctionCallInfo fcinfo = op->d.minmax.fcinfo_data;
MinMaxOp operator = op->d.minmax.op;
int off;
/* set at initialization */
Assert(fcinfo->args[0].isnull == false);
Assert(fcinfo->args[1].isnull == false);
/* default to null result */
*op->resnull = true;
for (off = 0; off < op->d.minmax.nelems; off++)
{
/* ignore NULL inputs */
if (nulls[off])
continue;
if (*op->resnull)
{
/* first nonnull input, adopt value */
*op->resvalue = values[off];
*op->resnull = false;
}
else
{
int cmpresult;
/* apply comparison function */
fcinfo->args[0].value = *op->resvalue;
fcinfo->args[1].value = values[off];
fcinfo->isnull = false;
cmpresult = DatumGetInt32(FunctionCallInvoke(fcinfo));
if (fcinfo->isnull) /* probably should not happen */
continue;
if (cmpresult > 0 && operator == IS_LEAST)
*op->resvalue = values[off];
else if (cmpresult < 0 && operator == IS_GREATEST)
*op->resvalue = values[off];
}
}
}
/*
* Evaluate a FieldSelect node.
*
* Source record is in step's result variable.
*/
void
ExecEvalFieldSelect(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
AttrNumber fieldnum = op->d.fieldselect.fieldnum;
Datum tupDatum;
HeapTupleHeader tuple;
Oid tupType;
int32 tupTypmod;
TupleDesc tupDesc;
Form_pg_attribute attr;
HeapTupleData tmptup;
/* NULL record -> NULL result */
if (*op->resnull)
return;
tupDatum = *op->resvalue;
/* We can special-case expanded records for speed */
if (VARATT_IS_EXTERNAL_EXPANDED(DatumGetPointer(tupDatum)))
{
ExpandedRecordHeader *erh = (ExpandedRecordHeader *) DatumGetEOHP(tupDatum);
Assert(erh->er_magic == ER_MAGIC);
/* Extract record's TupleDesc */
tupDesc = expanded_record_get_tupdesc(erh);
/*
* Find field's attr record. Note we don't support system columns
* here: a datum tuple doesn't have valid values for most of the
* interesting system columns anyway.
*/
if (fieldnum <= 0) /* should never happen */
elog(ERROR, "unsupported reference to system column %d in FieldSelect",
fieldnum);
if (fieldnum > tupDesc->natts) /* should never happen */
elog(ERROR, "attribute number %d exceeds number of columns %d",
fieldnum, tupDesc->natts);
attr = TupleDescAttr(tupDesc, fieldnum - 1);
/* Check for dropped column, and force a NULL result if so */
if (attr->attisdropped)
{
*op->resnull = true;
return;
}
/* Check for type mismatch --- possible after ALTER COLUMN TYPE? */
/* As in CheckVarSlotCompatibility, we should but can't check typmod */
if (op->d.fieldselect.resulttype != attr->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("attribute %d has wrong type", fieldnum),
errdetail("Table has type %s, but query expects %s.",
format_type_be(attr->atttypid),
format_type_be(op->d.fieldselect.resulttype))));
/* extract the field */
*op->resvalue = expanded_record_get_field(erh, fieldnum,
op->resnull);
}
else
{
/* Get the composite datum and extract its type fields */
tuple = DatumGetHeapTupleHeader(tupDatum);
tupType = HeapTupleHeaderGetTypeId(tuple);
tupTypmod = HeapTupleHeaderGetTypMod(tuple);
/* Lookup tupdesc if first time through or if type changes */
tupDesc = get_cached_rowtype(tupType, tupTypmod,
&op->d.fieldselect.argdesc,
econtext);
/*
* Find field's attr record. Note we don't support system columns
* here: a datum tuple doesn't have valid values for most of the
* interesting system columns anyway.
*/
if (fieldnum <= 0) /* should never happen */
elog(ERROR, "unsupported reference to system column %d in FieldSelect",
fieldnum);
if (fieldnum > tupDesc->natts) /* should never happen */
elog(ERROR, "attribute number %d exceeds number of columns %d",
fieldnum, tupDesc->natts);
attr = TupleDescAttr(tupDesc, fieldnum - 1);
/* Check for dropped column, and force a NULL result if so */
if (attr->attisdropped)
{
*op->resnull = true;
return;
}
/* Check for type mismatch --- possible after ALTER COLUMN TYPE? */
/* As in CheckVarSlotCompatibility, we should but can't check typmod */
if (op->d.fieldselect.resulttype != attr->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("attribute %d has wrong type", fieldnum),
errdetail("Table has type %s, but query expects %s.",
format_type_be(attr->atttypid),
format_type_be(op->d.fieldselect.resulttype))));
/* heap_getattr needs a HeapTuple not a bare HeapTupleHeader */
tmptup.t_len = HeapTupleHeaderGetDatumLength(tuple);
tmptup.t_data = tuple;
/* extract the field */
*op->resvalue = heap_getattr(&tmptup,
fieldnum,
tupDesc,
op->resnull);
}
}
/*
* Deform source tuple, filling in the step's values/nulls arrays, before
* evaluating individual new values as part of a FieldStore expression.
* Subsequent steps will overwrite individual elements of the values/nulls
* arrays with the new field values, and then FIELDSTORE_FORM will build the
* new tuple value.
*
* Source record is in step's result variable.
*/
void
ExecEvalFieldStoreDeForm(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
TupleDesc tupDesc;
/* Lookup tupdesc if first time through or after rescan */
tupDesc = get_cached_rowtype(op->d.fieldstore.fstore->resulttype, -1,
op->d.fieldstore.argdesc, econtext);
/* Check that current tupdesc doesn't have more fields than we allocated */
if (unlikely(tupDesc->natts > op->d.fieldstore.ncolumns))
elog(ERROR, "too many columns in composite type %u",
op->d.fieldstore.fstore->resulttype);
if (*op->resnull)
{
/* Convert null input tuple into an all-nulls row */
memset(op->d.fieldstore.nulls, true,
op->d.fieldstore.ncolumns * sizeof(bool));
}
else
{
/*
* heap_deform_tuple needs a HeapTuple not a bare HeapTupleHeader. We
* set all the fields in the struct just in case.
*/
Datum tupDatum = *op->resvalue;
HeapTupleHeader tuphdr;
HeapTupleData tmptup;
tuphdr = DatumGetHeapTupleHeader(tupDatum);
tmptup.t_len = HeapTupleHeaderGetDatumLength(tuphdr);
ItemPointerSetInvalid(&(tmptup.t_self));
tmptup.t_tableOid = InvalidOid;
tmptup.t_data = tuphdr;
heap_deform_tuple(&tmptup, tupDesc,
op->d.fieldstore.values,
op->d.fieldstore.nulls);
}
}
/*
* Compute the new composite datum after each individual field value of a
* FieldStore expression has been evaluated.
*/
void
ExecEvalFieldStoreForm(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
HeapTuple tuple;
/* argdesc should already be valid from the DeForm step */
tuple = heap_form_tuple(*op->d.fieldstore.argdesc,
op->d.fieldstore.values,
op->d.fieldstore.nulls);
*op->resvalue = HeapTupleGetDatum(tuple);
*op->resnull = false;
}
/*
* Process a subscript in a SubscriptingRef expression.
*
* If subscript is NULL, throw error in assignment case, or in fetch case
* set result to NULL and return false (instructing caller to skip the rest
* of the SubscriptingRef sequence).
*
* Subscript expression result is in subscriptvalue/subscriptnull.
* On success, integer subscript value has been saved in upperindex[] or
* lowerindex[] for use later.
*/
bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
int *indexes;
int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
{
if (sbsrefstate->isassignment)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("array subscript in assignment must not be null")));
*op->resnull = true;
return false;
}
/* Convert datum to int, save in appropriate place */
if (op->d.sbsref_subscript.isupper)
indexes = sbsrefstate->upperindex;
else
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
return true;
}
/*
* Evaluate SubscriptingRef fetch.
*
* Source container is in step's result variable.
*/
void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
if (sbsrefstate->numlower == 0)
{
/* Scalar case */
*op->resvalue = array_get_element(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign,
op->resnull);
}
else
{
/* Slice case */
*op->resvalue = array_get_slice(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->lowerindex,
sbsrefstate->upperprovided,
sbsrefstate->lowerprovided,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign);
}
}
/*
* Compute old container element/slice value for a SubscriptingRef assignment
* expression. Will only be generated if the new-value subexpression
* contains SubscriptingRef or FieldStore. The value is stored into the
* SubscriptingRefState's prevvalue/prevnull fields.
*/
void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
if (*op->resnull)
{
/* whole array is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
else if (sbsrefstate->numlower == 0)
{
/* Scalar case */
sbsrefstate->prevvalue = array_get_element(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign,
&sbsrefstate->prevnull);
}
else
{
/* Slice case */
/* this is currently unreachable */
sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->lowerindex,
sbsrefstate->upperprovided,
sbsrefstate->lowerprovided,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign);
sbsrefstate->prevnull = false;
}
}
/*
* Evaluate SubscriptingRef assignment.
*
* Input container (possibly null) is in result area, replacement value is in
* SubscriptingRefState's replacevalue/replacenull.
*/
void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
/*
* For an assignment to a fixed-length container type, both the original
* container and the value to be assigned into it must be non-NULL, else
* we punt and return the original container.
*/
if (sbsrefstate->refattrlength > 0)
{
if (*op->resnull || sbsrefstate->replacenull)
return;
}
/*
* For assignment to varlena arrays, we handle a NULL original array by
* substituting an empty (zero-dimensional) array; insertion of the new
* element will result in a singleton array value. It does not matter
* whether the new element is NULL.
*/
if (*op->resnull)
{
*op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
*op->resnull = false;
}
if (sbsrefstate->numlower == 0)
{
/* Scalar case */
*op->resvalue = array_set_element(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->replacevalue,
sbsrefstate->replacenull,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign);
}
else
{
/* Slice case */
*op->resvalue = array_set_slice(*op->resvalue,
sbsrefstate->numupper,
sbsrefstate->upperindex,
sbsrefstate->lowerindex,
sbsrefstate->upperprovided,
sbsrefstate->lowerprovided,
sbsrefstate->replacevalue,
sbsrefstate->replacenull,
sbsrefstate->refattrlength,
sbsrefstate->refelemlength,
sbsrefstate->refelembyval,
sbsrefstate->refelemalign);
}
}
/*
* Evaluate a rowtype coercion operation.
* This may require rearranging field positions.
*
* Source record is in step's result variable.
*/
void
ExecEvalConvertRowtype(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
ConvertRowtypeExpr *convert = op->d.convert_rowtype.convert;
HeapTuple result;
Datum tupDatum;
HeapTupleHeader tuple;
HeapTupleData tmptup;
TupleDesc indesc,
outdesc;
/* NULL in -> NULL out */
if (*op->resnull)
return;
tupDatum = *op->resvalue;
tuple = DatumGetHeapTupleHeader(tupDatum);
/* Lookup tupdescs if first time through or after rescan */
if (op->d.convert_rowtype.indesc == NULL)
{
get_cached_rowtype(exprType((Node *) convert->arg), -1,
&op->d.convert_rowtype.indesc,
econtext);
op->d.convert_rowtype.initialized = false;
}
if (op->d.convert_rowtype.outdesc == NULL)
{
get_cached_rowtype(convert->resulttype, -1,
&op->d.convert_rowtype.outdesc,
econtext);
op->d.convert_rowtype.initialized = false;
}
indesc = op->d.convert_rowtype.indesc;
outdesc = op->d.convert_rowtype.outdesc;
/*
* We used to be able to assert that incoming tuples are marked with
* exactly the rowtype of indesc. However, now that ExecEvalWholeRowVar
* might change the tuples' marking to plain RECORD due to inserting
* aliases, we can only make this weak test:
*/
Assert(HeapTupleHeaderGetTypeId(tuple) == indesc->tdtypeid ||
HeapTupleHeaderGetTypeId(tuple) == RECORDOID);
/* if first time through, initialize conversion map */
if (!op->d.convert_rowtype.initialized)
{
MemoryContext old_cxt;
/* allocate map in long-lived memory context */
old_cxt = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
/* prepare map from old to new attribute numbers */
op->d.convert_rowtype.map =
convert_tuples_by_name(indesc, outdesc,
gettext_noop("could not convert row type"));
op->d.convert_rowtype.initialized = true;
MemoryContextSwitchTo(old_cxt);
}
/* Following steps need a HeapTuple not a bare HeapTupleHeader */
tmptup.t_len = HeapTupleHeaderGetDatumLength(tuple);
tmptup.t_data = tuple;
if (op->d.convert_rowtype.map != NULL)
{
/* Full conversion with attribute rearrangement needed */
result = execute_attr_map_tuple(&tmptup, op->d.convert_rowtype.map);
/* Result already has appropriate composite-datum header fields */
*op->resvalue = HeapTupleGetDatum(result);
}
else
{
/*
* The tuple is physically compatible as-is, but we need to insert the
* destination rowtype OID in its composite-datum header field, so we
* have to copy it anyway. heap_copy_tuple_as_datum() is convenient
* for this since it will both make the physical copy and insert the
* correct composite header fields. Note that we aren't expecting to
* have to flatten any toasted fields: the input was a composite
* datum, so it shouldn't contain any. So heap_copy_tuple_as_datum()
* is overkill here, but its check for external fields is cheap.
*/
*op->resvalue = heap_copy_tuple_as_datum(&tmptup, outdesc);
}
}
/*
* Evaluate "scalar op ANY/ALL (array)".
*
* Source array is in our result area, scalar arg is already evaluated into
* fcinfo->args[0].
*
* The operator always yields boolean, and we combine the results across all
* array elements using OR and AND (for ANY and ALL respectively). Of course
* we short-circuit as soon as the result is known.
*/
void
ExecEvalScalarArrayOp(ExprState *state, ExprEvalStep *op)
{
FunctionCallInfo fcinfo = op->d.scalararrayop.fcinfo_data;
bool useOr = op->d.scalararrayop.useOr;
bool strictfunc = op->d.scalararrayop.finfo->fn_strict;
ArrayType *arr;
int nitems;
Datum result;
bool resultnull;
int i;
int16 typlen;
bool typbyval;
char typalign;
char *s;
bits8 *bitmap;
int bitmask;
/*
* If the array is NULL then we return NULL --- it's not very meaningful
* to do anything else, even if the operator isn't strict.
*/
if (*op->resnull)
return;
/* Else okay to fetch and detoast the array */
arr = DatumGetArrayTypeP(*op->resvalue);
/*
* If the array is empty, we return either FALSE or TRUE per the useOr
* flag. This is correct even if the scalar is NULL; since we would
* evaluate the operator zero times, it matters not whether it would want
* to return NULL.
*/
nitems = ArrayGetNItems(ARR_NDIM(arr), ARR_DIMS(arr));
if (nitems <= 0)
{
*op->resvalue = BoolGetDatum(!useOr);
*op->resnull = false;
return;
}
/*
* If the scalar is NULL, and the function is strict, return NULL; no
* point in iterating the loop.
*/
if (fcinfo->args[0].isnull && strictfunc)
{
*op->resnull = true;
return;
}
/*
* We arrange to look up info about the element type only once per series
* of calls, assuming the element type doesn't change underneath us.
*/
if (op->d.scalararrayop.element_type != ARR_ELEMTYPE(arr))
{
get_typlenbyvalalign(ARR_ELEMTYPE(arr),
&op->d.scalararrayop.typlen,
&op->d.scalararrayop.typbyval,
&op->d.scalararrayop.typalign);
op->d.scalararrayop.element_type = ARR_ELEMTYPE(arr);
}
typlen = op->d.scalararrayop.typlen;
typbyval = op->d.scalararrayop.typbyval;
typalign = op->d.scalararrayop.typalign;
/* Initialize result appropriately depending on useOr */
result = BoolGetDatum(!useOr);
resultnull = false;
/* Loop over the array elements */
s = (char *) ARR_DATA_PTR(arr);
bitmap = ARR_NULLBITMAP(arr);
bitmask = 1;
for (i = 0; i < nitems; i++)
{
Datum elt;
Datum thisresult;
/* Get array element, checking for NULL */
if (bitmap && (*bitmap & bitmask) == 0)
{
fcinfo->args[1].value = (Datum) 0;
fcinfo->args[1].isnull = true;
}
else
{
elt = fetch_att(s, typbyval, typlen);
s = att_addlength_pointer(s, typlen, s);
s = (char *) att_align_nominal(s, typalign);
fcinfo->args[1].value = elt;
fcinfo->args[1].isnull = false;
}
/* Call comparison function */
if (fcinfo->args[1].isnull && strictfunc)
{
fcinfo->isnull = true;
thisresult = (Datum) 0;
}
else
{
fcinfo->isnull = false;
thisresult = op->d.scalararrayop.fn_addr(fcinfo);
}
/* Combine results per OR or AND semantics */
if (fcinfo->isnull)
resultnull = true;
else if (useOr)
{
if (DatumGetBool(thisresult))
{
result = BoolGetDatum(true);
resultnull = false;
break; /* needn't look at any more elements */
}
}
else
{
if (!DatumGetBool(thisresult))
{
result = BoolGetDatum(false);
resultnull = false;
break; /* needn't look at any more elements */
}
}
/* advance bitmap pointer if any */
if (bitmap)
{
bitmask <<= 1;
if (bitmask == 0x100)
{
bitmap++;
bitmask = 1;
}
}
}
*op->resvalue = result;
*op->resnull = resultnull;
}
/*
* Fast-path versin of "scalar op ANY/ALL (array)".
*
* Used when 'op' is one of the hard-coded built-in functions, and array is a Const.
*
* Source array has already been deconstructed in op->fp_len/fp_datum arrays.
* Scalar arg is already evaluated into op->scalarval.
*
* The operator always yields boolean, and we combine the results across all
* array elements using OR and AND (for ANY and ALL respectively). Of course
* we short-circuit as soon as the result is known.
*/
void
ExecEvalScalarArrayOpFastInt(ExprState *state, ExprEvalStep *op)
{
Oid opfuncid = op->d.scalararrayop_fast.opfuncid;
int nelems;
Datum *fp_datum;
Datum scalar;
bool result;
/*
* If the scalar is NULL, and the function is strict, return NULL; no
* point in iterating the loop.
*
* (All the hard-coded built-in eq functions we support are strict.)
*/
if (*op->resnull)
return;
/* Else fetch the scalar argument */
scalar = *op->resvalue;
if (opfuncid == F_INT4EQ || opfuncid == F_DATE_EQ)
scalar = Int32GetDatum(DatumGetInt32(scalar));
else if (opfuncid == F_INT2EQ)
{
Assert(opfuncid == F_INT2EQ);
scalar = Int16GetDatum(DatumGetInt16(scalar));
}
else
{
Assert (opfuncid == F_INT8EQ);
scalar = Int64GetDatum(DatumGetInt64(scalar));
}
nelems = op->d.scalararrayop_fast.fp_n;
fp_datum = op->d.scalararrayop_fast.fp_datum;
result = false;
for (int i = 0; i < nelems; i++)
{
if (scalar == fp_datum[i])
{
result = true;
break;
}
}
*op->resvalue = BoolGetDatum(result);
*op->resnull = false;
}
/*
* Fast-path version of "scalar op ANY/ALL (array)", texteq() variant.
*/
void
ExecEvalScalarArrayOpFastStr(ExprState *state, ExprEvalStep *op)
{
Oid opfuncid = op->d.scalararrayop_fast.opfuncid;
int nelems;
int *fp_len;
Datum *fp_datum;
Datum scalar;
bool result;
char *p; void *tofree; int len;
/*
* If the scalar is NULL, and the function is strict, return NULL; no
* point in iterating the loop.
*
* (All the hard-coded built-in eq functions we support are strict.)
*/
if (*op->resnull)
return;
/* Else fetch the scalar argument */
scalar = *op->resvalue;
varattrib_untoast_ptr_len(scalar, &p, &len, &tofree);
/* bpchareq, rid of trailing white space. see bpeq and bcTruelen */
if (opfuncid == F_BPCHAREQ)
{
while(len > 0 && p[len-1] == ' ')
--len;
}
nelems = op->d.scalararrayop_fast.fp_n;
fp_len = op->d.scalararrayop_fast.fp_len;
fp_datum = op->d.scalararrayop_fast.fp_datum;
result = false;
for (int i = 0; i < nelems; i++)
{
if (fp_len[i] != len)
continue;
if (memcmp(p, DatumGetPointer(fp_datum[i]), fp_len[i]) == 0)
{
result = true;
break;
}
}
if (tofree)
pfree(tofree);
*op->resvalue = BoolGetDatum(result);
*op->resnull = false;
}
/*
* Evaluate a NOT NULL domain constraint.
*/
void
ExecEvalConstraintNotNull(ExprState *state, ExprEvalStep *op)
{
if (*op->resnull)
ereport(ERROR,
(errcode(ERRCODE_NOT_NULL_VIOLATION),
errmsg("domain %s does not allow null values",
format_type_be(op->d.domaincheck.resulttype)),
errdatatype(op->d.domaincheck.resulttype)));
}
/*
* Evaluate a CHECK domain constraint.
*/
void
ExecEvalConstraintCheck(ExprState *state, ExprEvalStep *op)
{
if (!*op->d.domaincheck.checknull &&
!DatumGetBool(*op->d.domaincheck.checkvalue))
ereport(ERROR,
(errcode(ERRCODE_CHECK_VIOLATION),
errmsg("value for domain %s violates check constraint \"%s\"",
format_type_be(op->d.domaincheck.resulttype),
op->d.domaincheck.constraintname),
errdomainconstraint(op->d.domaincheck.resulttype,
op->d.domaincheck.constraintname)));
}
/*
* Evaluate the various forms of XmlExpr.
*
* Arguments have been evaluated into named_argvalue/named_argnull
* and/or argvalue/argnull arrays.
*/
void
ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op)
{
XmlExpr *xexpr = op->d.xmlexpr.xexpr;
Datum value;
int i;
*op->resnull = true; /* until we get a result */
*op->resvalue = (Datum) 0;
switch (xexpr->op)
{
case IS_XMLCONCAT:
{
Datum *argvalue = op->d.xmlexpr.argvalue;
bool *argnull = op->d.xmlexpr.argnull;
List *values = NIL;
for (i = 0; i < list_length(xexpr->args); i++)
{
if (!argnull[i])
values = lappend(values, DatumGetPointer(argvalue[i]));
}
if (values != NIL)
{
*op->resvalue = PointerGetDatum(xmlconcat(values));
*op->resnull = false;
}
}
break;
case IS_XMLFOREST:
{
Datum *argvalue = op->d.xmlexpr.named_argvalue;
bool *argnull = op->d.xmlexpr.named_argnull;
StringInfoData buf;
ListCell *lc;
ListCell *lc2;
initStringInfo(&buf);
i = 0;
forboth(lc, xexpr->named_args, lc2, xexpr->arg_names)
{
Expr *e = (Expr *) lfirst(lc);
char *argname = strVal(lfirst(lc2));
if (!argnull[i])
{
value = argvalue[i];
appendStringInfo(&buf, "<%s>%s</%s>",
argname,
map_sql_value_to_xml_value(value,
exprType((Node *) e), true),
argname);
*op->resnull = false;
}
i++;
}
if (!*op->resnull)
{
text *result;
result = cstring_to_text_with_len(buf.data, buf.len);
*op->resvalue = PointerGetDatum(result);
}
pfree(buf.data);
}
break;
case IS_XMLELEMENT:
*op->resvalue = PointerGetDatum(xmlelement(xexpr,
op->d.xmlexpr.named_argvalue,
op->d.xmlexpr.named_argnull,
op->d.xmlexpr.argvalue,
op->d.xmlexpr.argnull));
*op->resnull = false;
break;
case IS_XMLPARSE:
{
Datum *argvalue = op->d.xmlexpr.argvalue;
bool *argnull = op->d.xmlexpr.argnull;
text *data;
bool preserve_whitespace;
/* arguments are known to be text, bool */
Assert(list_length(xexpr->args) == 2);
if (argnull[0])
return;
value = argvalue[0];
data = DatumGetTextPP(value);
if (argnull[1]) /* probably can't happen */
return;
value = argvalue[1];
preserve_whitespace = DatumGetBool(value);
*op->resvalue = PointerGetDatum(xmlparse(data,
xexpr->xmloption,
preserve_whitespace));
*op->resnull = false;
}
break;
case IS_XMLPI:
{
text *arg;
bool isnull;
/* optional argument is known to be text */
Assert(list_length(xexpr->args) <= 1);
if (xexpr->args)
{
isnull = op->d.xmlexpr.argnull[0];
if (isnull)
arg = NULL;
else
arg = DatumGetTextPP(op->d.xmlexpr.argvalue[0]);
}
else
{
arg = NULL;
isnull = false;
}
*op->resvalue = PointerGetDatum(xmlpi(xexpr->name,
arg,
isnull,
op->resnull));
}
break;
case IS_XMLROOT:
{
Datum *argvalue = op->d.xmlexpr.argvalue;
bool *argnull = op->d.xmlexpr.argnull;
xmltype *data;
text *version;
int standalone;
/* arguments are known to be xml, text, int */
Assert(list_length(xexpr->args) == 3);
if (argnull[0])
return;
data = DatumGetXmlP(argvalue[0]);
if (argnull[1])
version = NULL;
else
version = DatumGetTextPP(argvalue[1]);
Assert(!argnull[2]); /* always present */
standalone = DatumGetInt32(argvalue[2]);
*op->resvalue = PointerGetDatum(xmlroot(data,
version,
standalone));
*op->resnull = false;
}
break;
case IS_XMLSERIALIZE:
{
Datum *argvalue = op->d.xmlexpr.argvalue;
bool *argnull = op->d.xmlexpr.argnull;
/* argument type is known to be xml */
Assert(list_length(xexpr->args) == 1);
if (argnull[0])
return;
value = argvalue[0];
*op->resvalue = PointerGetDatum(
xmltotext_with_xmloption(DatumGetXmlP(value),
xexpr->xmloption));
*op->resnull = false;
}
break;
case IS_DOCUMENT:
{
Datum *argvalue = op->d.xmlexpr.argvalue;
bool *argnull = op->d.xmlexpr.argnull;
/* optional argument is known to be xml */
Assert(list_length(xexpr->args) == 1);
if (argnull[0])
return;
value = argvalue[0];
*op->resvalue =
BoolGetDatum(xml_is_document(DatumGetXmlP(value)));
*op->resnull = false;
}
break;
default:
elog(ERROR, "unrecognized XML operation");
break;
}
}
/*
* ExecEvalGroupingFunc
*
* Computes a bitmask with a bit for each (unevaluated) argument expression
* (rightmost arg is least significant bit).
*
* A bit is set if the corresponding expression is NOT part of the set of
* grouping expressions in the current grouping set.
*/
void
ExecEvalGroupingFunc(ExprState *state, ExprEvalStep *op)
{
int result = 0;
Bitmapset *grouped_cols = op->d.grouping_func.parent->grouped_cols;
ListCell *lc;
foreach(lc, op->d.grouping_func.clauses)
{
int attnum = lfirst_int(lc);
result <<= 1;
if (!bms_is_member(attnum, grouped_cols))
result |= 1;
}
*op->resvalue = Int32GetDatum(result);
*op->resnull = false;
}
/*
* Hand off evaluation of a subplan to nodeSubplan.c
*/
void
ExecEvalSubPlan(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
SubPlanState *sstate = op->d.subplan.sstate;
/* could potentially be nested, so make sure there's enough stack */
check_stack_depth();
*op->resvalue = ExecSubPlan(sstate, econtext, op->resnull);
}
/*
* Hand off evaluation of an alternative subplan to nodeSubplan.c
*/
void
ExecEvalAlternativeSubPlan(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
AlternativeSubPlanState *asstate = op->d.alternative_subplan.asstate;
/* could potentially be nested, so make sure there's enough stack */
check_stack_depth();
*op->resvalue = ExecAlternativeSubPlan(asstate, econtext, op->resnull);
}
/*
* Evaluate a wholerow Var expression.
*
* Returns a Datum whose value is the value of a whole-row range variable
* with respect to given expression context.
*/
void
ExecEvalWholeRowVar(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
Var *variable = op->d.wholerow.var;
TupleTableSlot *slot;
TupleDesc output_tupdesc;
MemoryContext oldcontext;
HeapTupleHeader dtuple;
HeapTuple tuple;
/* This was checked by ExecInitExpr */
Assert(variable->varattno == InvalidAttrNumber);
/* Get the input slot we want */
switch (variable->varno)
{
case INNER_VAR:
/* get the tuple from the inner node */
slot = econtext->ecxt_innertuple;
break;
case OUTER_VAR:
/* get the tuple from the outer node */
slot = econtext->ecxt_outertuple;
break;
/* INDEX_VAR is handled by default case */
default:
/* get the tuple from the relation being scanned */
slot = econtext->ecxt_scantuple;
break;
}
/* Apply the junkfilter if any */
if (op->d.wholerow.junkFilter != NULL)
slot = ExecFilterJunk(op->d.wholerow.junkFilter, slot);
/*
* If first time through, obtain tuple descriptor and check compatibility.
*
* XXX: It'd be great if this could be moved to the expression
* initialization phase, but due to using slots that's currently not
* feasible.
*/
if (op->d.wholerow.first)
{
/* optimistically assume we don't need slow path */
op->d.wholerow.slow = false;
/*
* If the Var identifies a named composite type, we must check that
* the actual tuple type is compatible with it.
*/
if (variable->vartype != RECORDOID)
{
TupleDesc var_tupdesc;
TupleDesc slot_tupdesc;
int i;
/*
* We really only care about numbers of attributes and data types.
* Also, we can ignore type mismatch on columns that are dropped
* in the destination type, so long as (1) the physical storage
* matches or (2) the actual column value is NULL. Case (1) is
* helpful in some cases involving out-of-date cached plans, while
* case (2) is expected behavior in situations such as an INSERT
* into a table with dropped columns (the planner typically
* generates an INT4 NULL regardless of the dropped column type).
* If we find a dropped column and cannot verify that case (1)
* holds, we have to use the slow path to check (2) for each row.
*
* If vartype is a domain over composite, just look through that
* to the base composite type.
*/
var_tupdesc = lookup_rowtype_tupdesc_domain(variable->vartype,
-1, false);
slot_tupdesc = slot->tts_tupleDescriptor;
if (var_tupdesc->natts != slot_tupdesc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("table row type and query-specified row type do not match"),
errdetail_plural("Table row contains %d attribute, but query expects %d.",
"Table row contains %d attributes, but query expects %d.",
slot_tupdesc->natts,
slot_tupdesc->natts,
var_tupdesc->natts)));
for (i = 0; i < var_tupdesc->natts; i++)
{
Form_pg_attribute vattr = TupleDescAttr(var_tupdesc, i);
Form_pg_attribute sattr = TupleDescAttr(slot_tupdesc, i);
if (vattr->atttypid == sattr->atttypid)
continue; /* no worries */
if (!vattr->attisdropped)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("table row type and query-specified row type do not match"),
errdetail("Table has type %s at ordinal position %d, but query expects %s.",
format_type_be(sattr->atttypid),
i + 1,
format_type_be(vattr->atttypid))));
if (vattr->attlen != sattr->attlen ||
vattr->attalign != sattr->attalign)
op->d.wholerow.slow = true; /* need to check for nulls */
}
/*
* Use the variable's declared rowtype as the descriptor for the
* output values, modulo possibly assigning new column names
* below. In particular, we *must* absorb any attisdropped
* markings.
*/
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
output_tupdesc = CreateTupleDescCopy(var_tupdesc);
MemoryContextSwitchTo(oldcontext);
ReleaseTupleDesc(var_tupdesc);
}
else
{
/*
* In the RECORD case, we use the input slot's rowtype as the
* descriptor for the output values, modulo possibly assigning new
* column names below.
*/
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
output_tupdesc = CreateTupleDescCopy(slot->tts_tupleDescriptor);
MemoryContextSwitchTo(oldcontext);
}
/*
* Construct a tuple descriptor for the composite values we'll
* produce, and make sure its record type is "blessed". The main
* reason to do this is to be sure that operations such as
* row_to_json() will see the desired column names when they look up
* the descriptor from the type information embedded in the composite
* values.
*
* We already got the correct physical datatype info above, but now we
* should try to find the source RTE and adopt its column aliases, in
* case they are different from the original rowtype's names. For
* example, in "SELECT foo(t) FROM tab t(x,y)", the first two columns
* in the composite output should be named "x" and "y" regardless of
* tab's column names.
*
* If we can't locate the RTE, assume the column names we've got are
* OK. (As of this writing, the only cases where we can't locate the
* RTE are in execution of trigger WHEN clauses, and then the Var will
* have the trigger's relation's rowtype, so its names are fine.)
* Also, if the creator of the RTE didn't bother to fill in an eref
* field, assume our column names are OK. (This happens in COPY, and
* perhaps other places.)
*/
if (econtext->ecxt_estate &&
variable->varno <= econtext->ecxt_estate->es_range_table_size)
{
RangeTblEntry *rte = exec_rt_fetch(variable->varno,
econtext->ecxt_estate);
if (rte->eref)
ExecTypeSetColNames(output_tupdesc, rte->eref->colnames);
}
/* Bless the tupdesc if needed, and save it in the execution state */
op->d.wholerow.tupdesc = BlessTupleDesc(output_tupdesc);
op->d.wholerow.first = false;
}
/*
* Make sure all columns of the slot are accessible in the slot's
* Datum/isnull arrays.
*/
slot_getallattrs(slot);
if (op->d.wholerow.slow)
{
/* Check to see if any dropped attributes are non-null */
TupleDesc tupleDesc = slot->tts_tupleDescriptor;
TupleDesc var_tupdesc = op->d.wholerow.tupdesc;
int i;
Assert(var_tupdesc->natts == tupleDesc->natts);
for (i = 0; i < var_tupdesc->natts; i++)
{
Form_pg_attribute vattr = TupleDescAttr(var_tupdesc, i);
Form_pg_attribute sattr = TupleDescAttr(tupleDesc, i);
if (!vattr->attisdropped)
continue; /* already checked non-dropped cols */
if (slot->tts_isnull[i])
continue; /* null is always okay */
if (vattr->attlen != sattr->attlen ||
vattr->attalign != sattr->attalign)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("table row type and query-specified row type do not match"),
errdetail("Physical storage mismatch on dropped attribute at ordinal position %d.",
i + 1)));
}
}
/*
* Build a composite datum, making sure any toasted fields get detoasted.
*
* (Note: it is critical that we not change the slot's state here.)
*/
tuple = toast_build_flattened_tuple(slot->tts_tupleDescriptor,
slot->tts_values,
slot->tts_isnull);
dtuple = tuple->t_data;
/*
* Label the datum with the composite type info we identified before.
*
* (Note: we could skip doing this by passing op->d.wholerow.tupdesc to
* the tuple build step; but that seems a tad risky so let's not.)
*/
HeapTupleHeaderSetTypeId(dtuple, op->d.wholerow.tupdesc->tdtypeid);
HeapTupleHeaderSetTypMod(dtuple, op->d.wholerow.tupdesc->tdtypmod);
*op->resvalue = PointerGetDatum(dtuple);
*op->resnull = false;
}
void
ExecEvalSysVar(ExprState *state, ExprEvalStep *op, ExprContext *econtext,
TupleTableSlot *slot)
{
Datum d;
/* slot_getsysattr has sufficient defenses against bad attnums */
d = slot_getsysattr(slot,
op->d.var.attnum,
op->resnull);
*op->resvalue = d;
/* this ought to be unreachable, but it's cheap enough to check */
if (unlikely(*op->resnull))
elog(ERROR, "failed to fetch attribute from slot");
}
/*
* Transition value has not been initialized. This is the first non-NULL input
* value for a group. We use it as the initial value for transValue.
*/
void
ExecAggInitGroup(AggState *aggstate, AggStatePerTrans pertrans, AggStatePerGroup pergroup)
{
FunctionCallInfo fcinfo = pertrans->transfn_fcinfo;
MemoryContext oldContext;
/*
* We must copy the datum into aggcontext if it is pass-by-ref. We do not
* need to pfree the old transValue, since it's NULL. (We already checked
* that the agg's input type is binary-compatible with its transtype, so
* straight copy here is OK.)
*/
oldContext = MemoryContextSwitchTo(
aggstate->curaggcontext->ecxt_per_tuple_memory);
pergroup->transValue = datumCopy(fcinfo->args[1].value,
pertrans->transtypeByVal,
pertrans->transtypeLen);
pergroup->transValueIsNull = false;
pergroup->noTransValue = false;
MemoryContextSwitchTo(oldContext);
}
/*
* Ensure that the current transition value is a child of the aggcontext,
* rather than the per-tuple context.
*
* NB: This can change the current memory context.
*/
Datum
ExecAggTransReparent(AggState *aggstate, AggStatePerTrans pertrans,
Datum newValue, bool newValueIsNull,
Datum oldValue, bool oldValueIsNull)
{
Assert(newValue != oldValue);
if (!newValueIsNull)
{
MemoryContextSwitchTo(aggstate->curaggcontext->ecxt_per_tuple_memory);
if (DatumIsReadWriteExpandedObject(newValue,
false,
pertrans->transtypeLen) &&
MemoryContextGetParent(DatumGetEOHP(newValue)->eoh_context) == CurrentMemoryContext)
/* do nothing */ ;
else
newValue = datumCopy(newValue,
pertrans->transtypeByVal,
pertrans->transtypeLen);
}
else
{
/*
* Ensure that AggStatePerGroup->transValue ends up being 0, so
* callers can safely compare newValue/oldValue without having to
* check their respective nullness.
*/
newValue = (Datum) 0;
}
if (!oldValueIsNull)
{
if (DatumIsReadWriteExpandedObject(oldValue,
false,
pertrans->transtypeLen))
DeleteExpandedObject(oldValue);
else
pfree(DatumGetPointer(oldValue));
}
return newValue;
}
/*
* Invoke ordered transition function, with a datum argument.
*/
void
ExecEvalAggOrderedTransDatum(ExprState *state, ExprEvalStep *op,
ExprContext *econtext)
{
AggStatePerTrans pertrans = op->d.agg_trans.pertrans;
int setno = op->d.agg_trans.setno;
tuplesort_putdatum(pertrans->sortstates[setno],
*op->resvalue, *op->resnull);
}
/*
* Invoke ordered transition function, with a tuple argument.
*/
void
ExecEvalAggOrderedTransTuple(ExprState *state, ExprEvalStep *op,
ExprContext *econtext)
{
AggStatePerTrans pertrans = op->d.agg_trans.pertrans;
int setno = op->d.agg_trans.setno;
ExecClearTuple(pertrans->sortslot);
pertrans->sortslot->tts_nvalid = pertrans->numInputs;
ExecStoreVirtualTuple(pertrans->sortslot);
tuplesort_puttupleslot(pertrans->sortstates[setno], pertrans->sortslot);
}
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