greenplumn hashvalidate 源码
greenplumn hashvalidate 代码
文件路径：/src/backend/access/hash/hashvalidate.c
/*-------------------------------------------------------------------------
*
* hashvalidate.c
* Opclass validator for hash.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/access/hash/hashvalidate.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/amvalidate.h"
#include "access/hash.h"
#include "access/htup_details.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_opfamily.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "parser/parse_coerce.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/regproc.h"
#include "utils/syscache.h"
static bool check_hash_func_signature(Oid funcid, int16 amprocnum, Oid argtype);
/*
* Validator for a hash opclass.
*
* Some of the checks done here cover the whole opfamily, and therefore are
* redundant when checking each opclass in a family. But they don't run long
* enough to be much of a problem, so we accept the duplication rather than
* complicate the amvalidate API.
*/
bool
hashvalidate(Oid opclassoid)
{
bool result = true;
HeapTuple classtup;
Form_pg_opclass classform;
Oid opfamilyoid;
Oid opcintype;
char *opclassname;
HeapTuple familytup;
Form_pg_opfamily familyform;
char *opfamilyname;
CatCList *proclist,
*oprlist;
List *grouplist;
OpFamilyOpFuncGroup *opclassgroup;
List *hashabletypes = NIL;
int i;
ListCell *lc;
/* Fetch opclass information */
classtup = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclassoid));
if (!HeapTupleIsValid(classtup))
elog(ERROR, "cache lookup failed for operator class %u", opclassoid);
classform = (Form_pg_opclass) GETSTRUCT(classtup);
opfamilyoid = classform->opcfamily;
opcintype = classform->opcintype;
opclassname = NameStr(classform->opcname);
/* Fetch opfamily information */
familytup = SearchSysCache1(OPFAMILYOID, ObjectIdGetDatum(opfamilyoid));
if (!HeapTupleIsValid(familytup))
elog(ERROR, "cache lookup failed for operator family %u", opfamilyoid);
familyform = (Form_pg_opfamily) GETSTRUCT(familytup);
opfamilyname = NameStr(familyform->opfname);
/* Fetch all operators and support functions of the opfamily */
oprlist = SearchSysCacheList1(AMOPSTRATEGY, ObjectIdGetDatum(opfamilyoid));
proclist = SearchSysCacheList1(AMPROCNUM, ObjectIdGetDatum(opfamilyoid));
/* Check individual support functions */
for (i = 0; i < proclist->n_members; i++)
{
HeapTuple proctup = &proclist->members[i]->tuple;
Form_pg_amproc procform = (Form_pg_amproc) GETSTRUCT(proctup);
/*
* All hash functions should be registered with matching left/right
* types
*/
if (procform->amproclefttype != procform->amprocrighttype)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains support function %s with different left and right input types",
opfamilyname, "hash",
format_procedure(procform->amproc))));
result = false;
}
/* Check procedure numbers and function signatures */
switch (procform->amprocnum)
{
case HASHSTANDARD_PROC:
case HASHEXTENDED_PROC:
if (!check_hash_func_signature(procform->amproc, procform->amprocnum,
procform->amproclefttype))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains function %s with wrong signature for support number %d",
opfamilyname, "hash",
format_procedure(procform->amproc),
procform->amprocnum)));
result = false;
}
else
{
/* Remember which types we can hash */
hashabletypes =
list_append_unique_oid(hashabletypes,
procform->amproclefttype);
}
break;
default:
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains function %s with invalid support number %d",
opfamilyname, "hash",
format_procedure(procform->amproc),
procform->amprocnum)));
result = false;
break;
}
}
/* Check individual operators */
for (i = 0; i < oprlist->n_members; i++)
{
HeapTuple oprtup = &oprlist->members[i]->tuple;
Form_pg_amop oprform = (Form_pg_amop) GETSTRUCT(oprtup);
/* Check that only allowed strategy numbers exist */
if (oprform->amopstrategy < 1 ||
oprform->amopstrategy > HTMaxStrategyNumber)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains operator %s with invalid strategy number %d",
opfamilyname, "hash",
format_operator(oprform->amopopr),
oprform->amopstrategy)));
result = false;
}
/* hash doesn't support ORDER BY operators */
if (oprform->amoppurpose != AMOP_SEARCH ||
OidIsValid(oprform->amopsortfamily))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains invalid ORDER BY specification for operator %s",
opfamilyname, "hash",
format_operator(oprform->amopopr))));
result = false;
}
/* Check operator signature --- same for all hash strategies */
if (!check_amop_signature(oprform->amopopr, BOOLOID,
oprform->amoplefttype,
oprform->amoprighttype))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s contains operator %s with wrong signature",
opfamilyname, "hash",
format_operator(oprform->amopopr))));
result = false;
}
/* There should be relevant hash functions for each datatype */
if (!list_member_oid(hashabletypes, oprform->amoplefttype) ||
!list_member_oid(hashabletypes, oprform->amoprighttype))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s lacks support function for operator %s",
opfamilyname, "hash",
format_operator(oprform->amopopr))));
result = false;
}
}
/* Now check for inconsistent groups of operators/functions */
grouplist = identify_opfamily_groups(oprlist, proclist);
opclassgroup = NULL;
foreach(lc, grouplist)
{
OpFamilyOpFuncGroup *thisgroup = (OpFamilyOpFuncGroup *) lfirst(lc);
/* Remember the group exactly matching the test opclass */
if (thisgroup->lefttype == opcintype &&
thisgroup->righttype == opcintype)
opclassgroup = thisgroup;
/*
* Complain if there seems to be an incomplete set of operators for
* this datatype pair (implying that we have a hash function but no
* operator).
*/
if (thisgroup->operatorset != (1 << HTEqualStrategyNumber))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s is missing operator(s) for types %s and %s",
opfamilyname, "hash",
format_type_be(thisgroup->lefttype),
format_type_be(thisgroup->righttype))));
result = false;
}
}
/* Check that the originally-named opclass is supported */
/* (if group is there, we already checked it adequately above) */
if (!opclassgroup)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator class \"%s\" of access method %s is missing operator(s)",
opclassname, "hash")));
result = false;
}
/*
* Complain if the opfamily doesn't have entries for all possible
* combinations of its supported datatypes. While missing cross-type
* operators are not fatal, it seems reasonable to insist that all
* built-in hash opfamilies be complete.
*/
if (list_length(grouplist) !=
list_length(hashabletypes) * list_length(hashabletypes))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("operator family \"%s\" of access method %s is missing cross-type operator(s)",
opfamilyname, "hash")));
result = false;
}
ReleaseCatCacheList(proclist);
ReleaseCatCacheList(oprlist);
ReleaseSysCache(familytup);
ReleaseSysCache(classtup);
return result;
}
/*
* We need a custom version of check_amproc_signature because of assorted
* hacks in the core hash opclass definitions.
*/
static bool
check_hash_func_signature(Oid funcid, int16 amprocnum, Oid argtype)
{
bool result = true;
Oid restype;
int16 nargs;
HeapTuple tp;
Form_pg_proc procform;
switch (amprocnum)
{
case HASHSTANDARD_PROC:
restype = INT4OID;
nargs = 1;
break;
case HASHEXTENDED_PROC:
restype = INT8OID;
nargs = 2;
break;
default:
elog(ERROR, "invalid amprocnum");
}
tp = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
procform = (Form_pg_proc) GETSTRUCT(tp);
if (procform->prorettype != restype || procform->proretset ||
procform->pronargs != nargs)
result = false;
if (!IsBinaryCoercible(argtype, procform->proargtypes.values[0]))
{
/*
* Some of the built-in hash opclasses cheat by using hash functions
* that are different from but physically compatible with the opclass
* datatype. In some of these cases, even a "binary coercible" check
* fails because there's no relevant cast. For the moment, fix it by
* having a whitelist of allowed cases. Test the specific function
* identity, not just its input type, because hashvarlena() takes
* INTERNAL and allowing any such function seems too scary.
*/
if ((funcid == F_HASHINT4 || funcid == F_HASHINT4EXTENDED) &&
(argtype == DATEOID ||
argtype == XIDOID || argtype == CIDOID))
/* okay, allowed use of hashint4() */ ;
else if ((funcid == F_TIMESTAMP_HASH ||
funcid == F_TIMESTAMP_HASH_EXTENDED) &&
argtype == TIMESTAMPTZOID)
/* okay, allowed use of timestamp_hash() */ ;
else if ((funcid == F_HASHCHAR || funcid == F_HASHCHAREXTENDED) &&
argtype == BOOLOID)
/* okay, allowed use of hashchar() */ ;
else if ((funcid == F_HASHVARLENA || funcid == F_HASHVARLENAEXTENDED) &&
argtype == BYTEAOID)
/* okay, allowed use of hashvarlena() */ ;
else
result = false;
}
/* If function takes a second argument, it must be for a 64-bit salt. */
if (nargs == 2 && procform->proargtypes.values[1] != INT8OID)
result = false;
ReleaseSysCache(tp);
return result;
}
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