greenplumn brinfuncs 源码
greenplumn brinfuncs 代码
文件路径：/contrib/pageinspect/brinfuncs.c
/*
* brinfuncs.c
* Functions to investigate BRIN indexes
*
* Copyright (c) 2014-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/pageinspect/brinfuncs.c
*/
#include "postgres.h"
#include "pageinspect.h"
#include "access/htup_details.h"
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_page.h"
#include "access/brin_revmap.h"
#include "access/brin_tuple.h"
#include "catalog/index.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "lib/stringinfo.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "miscadmin.h"
PG_FUNCTION_INFO_V1(brin_page_type);
PG_FUNCTION_INFO_V1(brin_page_items);
PG_FUNCTION_INFO_V1(brin_metapage_info);
PG_FUNCTION_INFO_V1(brin_revmap_data);
PG_FUNCTION_INFO_V1(brin_upper_data);
typedef struct brin_column_state
{
int nstored;
FmgrInfo outputFn[FLEXIBLE_ARRAY_MEMBER];
} brin_column_state;
static Page verify_brin_page(bytea *raw_page, uint16 type,
const char *strtype);
Datum
brin_page_type(PG_FUNCTION_ARGS)
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
Page page = VARDATA(raw_page);
int raw_page_size;
char *type;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
if (raw_page_size != BLCKSZ)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input page too small"),
errdetail("Expected size %d, got %d",
BLCKSZ, raw_page_size)));
switch (BrinPageType(page))
{
case BRIN_PAGETYPE_META:
type = "meta";
break;
case BRIN_PAGETYPE_REVMAP:
type = "revmap";
break;
case BRIN_PAGETYPE_REGULAR:
type = "regular";
break;
case BRIN_PAGETYPE_UPPER:
type = "upper";
break;
default:
type = psprintf("unknown (%02x)", BrinPageType(page));
break;
}
PG_RETURN_TEXT_P(cstring_to_text(type));
}
/*
* Verify that the given bytea contains a BRIN page of the indicated page
* type, or die in the attempt. A pointer to the page is returned.
*/
static Page
verify_brin_page(bytea *raw_page, uint16 type, const char *strtype)
{
Page page;
int raw_page_size;
raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
if (raw_page_size != BLCKSZ)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input page too small"),
errdetail("Expected size %d, got %d",
BLCKSZ, raw_page_size)));
page = VARDATA(raw_page);
/* verify the special space says this page is what we want */
if (BrinPageType(page) != type)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("page is not a BRIN page of type \"%s\"", strtype),
errdetail("Expected special type %08x, got %08x.",
type, BrinPageType(page))));
return page;
}
/*
* Extract all item values from a BRIN index page
*
* Usage: SELECT * FROM brin_page_items(get_raw_page('idx', 1), 'idx'::regclass);
*/
Datum
brin_page_items(PG_FUNCTION_ARGS)
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
Oid indexRelid = PG_GETARG_OID(1);
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
TupleDesc tupdesc;
MemoryContext oldcontext;
Tuplestorestate *tupstore;
Relation indexRel;
brin_column_state **columns;
BrinDesc *bdesc;
BrinMemTuple *dtup;
Page page;
OffsetNumber offset;
AttrNumber attno;
bool unusedItem;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
/* check to see if caller supports us returning a tuplestore */
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("set-valued function called in context that cannot accept a set")));
if (!(rsinfo->allowedModes & SFRM_Materialize) ||
rsinfo->expectedDesc == NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("materialize mode required, but it is not allowed in this context")));
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
/* Build tuplestore to hold the result rows */
oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->returnMode = SFRM_Materialize;
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
indexRel = index_open(indexRelid, AccessShareLock);
bdesc = brin_build_desc(indexRel);
/* minimally verify the page we got */
page = verify_brin_page(raw_page, BRIN_PAGETYPE_REGULAR, "regular");
/*
* Initialize output functions for all indexed datatypes; simplifies
* calling them later.
*/
columns = palloc(sizeof(brin_column_state *) * RelationGetDescr(indexRel)->natts);
for (attno = 1; attno <= bdesc->bd_tupdesc->natts; attno++)
{
Oid output;
bool isVarlena;
BrinOpcInfo *opcinfo;
int i;
brin_column_state *column;
opcinfo = bdesc->bd_info[attno - 1];
column = palloc(offsetof(brin_column_state, outputFn) +
sizeof(FmgrInfo) * opcinfo->oi_nstored);
column->nstored = opcinfo->oi_nstored;
for (i = 0; i < opcinfo->oi_nstored; i++)
{
getTypeOutputInfo(opcinfo->oi_typcache[i]->type_id, &output, &isVarlena);
fmgr_info(output, &column->outputFn[i]);
}
columns[attno - 1] = column;
}
offset = FirstOffsetNumber;
unusedItem = false;
dtup = NULL;
for (;;)
{
Datum values[7];
bool nulls[7];
/*
* This loop is called once for every attribute of every tuple in the
* page. At the start of a tuple, we get a NULL dtup; that's our
* signal for obtaining and decoding the next one. If that's not the
* case, we output the next attribute.
*/
if (dtup == NULL)
{
ItemId itemId;
/* verify item status: if there's no data, we can't decode */
itemId = PageGetItemId(page, offset);
if (ItemIdIsUsed(itemId))
{
dtup = brin_deform_tuple(bdesc,
(BrinTuple *) PageGetItem(page, itemId),
NULL);
attno = 1;
unusedItem = false;
}
else
unusedItem = true;
}
else
attno++;
MemSet(nulls, 0, sizeof(nulls));
if (unusedItem)
{
values[0] = UInt16GetDatum(offset);
nulls[1] = true;
nulls[2] = true;
nulls[3] = true;
nulls[4] = true;
nulls[5] = true;
nulls[6] = true;
}
else
{
int att = attno - 1;
values[0] = UInt16GetDatum(offset);
values[1] = UInt32GetDatum(dtup->bt_blkno);
values[2] = UInt16GetDatum(attno);
values[3] = BoolGetDatum(dtup->bt_columns[att].bv_allnulls);
values[4] = BoolGetDatum(dtup->bt_columns[att].bv_hasnulls);
values[5] = BoolGetDatum(dtup->bt_placeholder);
if (!dtup->bt_columns[att].bv_allnulls)
{
BrinValues *bvalues = &dtup->bt_columns[att];
StringInfoData s;
bool first;
int i;
initStringInfo(&s);
appendStringInfoChar(&s, '{');
first = true;
for (i = 0; i < columns[att]->nstored; i++)
{
char *val;
if (!first)
appendStringInfoString(&s, " .. ");
first = false;
val = OutputFunctionCall(&columns[att]->outputFn[i],
bvalues->bv_values[i]);
appendStringInfoString(&s, val);
pfree(val);
}
appendStringInfoChar(&s, '}');
values[6] = CStringGetTextDatum(s.data);
pfree(s.data);
}
else
{
nulls[6] = true;
}
}
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
/*
* If the item was unused, jump straight to the next one; otherwise,
* the only cleanup needed here is to set our signal to go to the next
* tuple in the following iteration, by freeing the current one.
*/
if (unusedItem)
offset = OffsetNumberNext(offset);
else if (attno >= bdesc->bd_tupdesc->natts)
{
pfree(dtup);
dtup = NULL;
offset = OffsetNumberNext(offset);
}
/*
* If we're beyond the end of the page, we're done.
*/
if (offset > PageGetMaxOffsetNumber(page))
break;
}
/* clean up and return the tuplestore */
brin_free_desc(bdesc);
tuplestore_donestoring(tupstore);
index_close(indexRel, AccessShareLock);
return (Datum) 0;
}
Datum
brin_metapage_info(PG_FUNCTION_ARGS)
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
Page page;
BrinMetaPageData *meta;
TupleDesc tupdesc;
Datum values[4];
bool nulls[4];
HeapTuple htup;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
page = verify_brin_page(raw_page, BRIN_PAGETYPE_META, "metapage");
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
tupdesc = BlessTupleDesc(tupdesc);
/* Extract values from the metapage */
meta = (BrinMetaPageData *) PageGetContents(page);
MemSet(nulls, 0, sizeof(nulls));
values[0] = CStringGetTextDatum(psprintf("0x%08X", meta->brinMagic));
values[1] = Int32GetDatum(meta->brinVersion);
values[2] = Int32GetDatum(meta->pagesPerRange);
values[3] = Int64GetDatum(meta->lastRevmapPage);
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
/*
* Return the TID array stored in a BRIN revmap page
*/
Datum
brin_revmap_data(PG_FUNCTION_ARGS)
{
struct
{
ItemPointerData *tids;
int idx;
} *state;
FuncCallContext *fctx;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
if (SRF_IS_FIRSTCALL())
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
MemoryContext mctx;
Page page;
/* minimally verify the page we got */
page = verify_brin_page(raw_page, BRIN_PAGETYPE_REVMAP, "revmap");
/* create a function context for cross-call persistence */
fctx = SRF_FIRSTCALL_INIT();
/* switch to memory context appropriate for multiple function calls */
mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
state = palloc(sizeof(*state));
state->tids = ((RevmapContents *) PageGetContents(page))->rm_tids;
state->idx = 0;
fctx->user_fctx = state;
MemoryContextSwitchTo(mctx);
}
fctx = SRF_PERCALL_SETUP();
state = fctx->user_fctx;
if (state->idx < REVMAP_PAGE_MAXITEMS)
SRF_RETURN_NEXT(fctx, PointerGetDatum(&state->tids[state->idx++]));
SRF_RETURN_DONE(fctx);
}
/*
* Return the BlockNumber array stored in a BRIN upper page
*/
Datum
brin_upper_data(PG_FUNCTION_ARGS)
{
struct
{
BlockNumber *blks;
int idx;
} *state;
FuncCallContext *fctx;
ItemPointerData *tid;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
if (SRF_IS_FIRSTCALL())
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
MemoryContext mctx;
Page page;
/* minimally verify the page we got */
page = verify_brin_page(raw_page, BRIN_PAGETYPE_UPPER, "upper");
/* create a function context for cross-call persistence */
fctx = SRF_FIRSTCALL_INIT();
/* switch to memory context appropriate for multiple function calls */
mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
state = palloc(sizeof(*state));
state->blks = ((RevmapUpperBlockContents *) PageGetContents(page))->rm_blocks;
state->idx = 0;
fctx->user_fctx = state;
MemoryContextSwitchTo(mctx);
}
fctx = SRF_PERCALL_SETUP();
state = fctx->user_fctx;
if (state->idx < REVMAP_UPPER_PAGE_MAXITEMS)
{
tid = (ItemPointerData*) palloc(sizeof(ItemPointerData));
ItemPointerSetBlockNumber(tid, (BlockNumber) state->blks[state->idx++]);
ItemPointerSetOffsetNumber(tid, (OffsetNumber) 0);
SRF_RETURN_NEXT(fctx, PointerGetDatum(tid));
}
SRF_RETURN_DONE(fctx);
}
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