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/*-------------------------------------------------------------------------
*
* spginsert.c
* Externally visible index creation/insertion routines
*
* All the actual insertion logic is in spgdoinsert.c.
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/access/spgist/spginsert.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/spgist_private.h"
#include "access/spgxlog.h"
#include "access/tableam.h"
#include "access/xlog.h"
#include "access/xloginsert.h"
#include "catalog/index.h"
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "utils/memutils.h"
#include "utils/rel.h"
typedef struct
{
SpGistState spgstate; /* SPGiST's working state */
int64 indtuples; /* total number of tuples indexed */
MemoryContext tmpCtx; /* per-tuple temporary context */
} SpGistBuildState;
/* Callback to process one heap tuple during table_index_build_scan */
static void
spgistBuildCallback(Relation index, ItemPointer tid, Datum *values,
bool *isnull, bool tupleIsAlive, void *state)
{
SpGistBuildState *buildstate = (SpGistBuildState *) state;
MemoryContext oldCtx;
/* Work in temp context, and reset it after each tuple */
oldCtx = MemoryContextSwitchTo(buildstate->tmpCtx);
/*
* Even though no concurrent insertions can be happening, we still might
* get a buffer-locking failure due to bgwriter or checkpointer taking a
* lock on some buffer. So we need to be willing to retry. We can flush
* any temp data when retrying.
*/
while (!spgdoinsert(index, &buildstate->spgstate, tid,
values, isnull))
{
MemoryContextReset(buildstate->tmpCtx);
}
/* Update total tuple count */
buildstate->indtuples += 1;
MemoryContextSwitchTo(oldCtx);
MemoryContextReset(buildstate->tmpCtx);
}
/*
* Build an SP-GiST index.
*/
IndexBuildResult *
spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
{
IndexBuildResult *result;
double reltuples;
SpGistBuildState buildstate;
Buffer metabuffer,
rootbuffer,
nullbuffer;
if (RelationGetNumberOfBlocks(index) != 0)
elog(ERROR, "index \"%s\" already contains data",
RelationGetRelationName(index));
/*
* Initialize the meta page and root pages
*/
metabuffer = SpGistNewBuffer(index);
rootbuffer = SpGistNewBuffer(index);
nullbuffer = SpGistNewBuffer(index);
Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
START_CRIT_SECTION();
SpGistInitMetapage(BufferGetPage(metabuffer));
MarkBufferDirty(metabuffer);
SpGistInitBuffer(rootbuffer, SPGIST_LEAF);
MarkBufferDirty(rootbuffer);
SpGistInitBuffer(nullbuffer, SPGIST_LEAF | SPGIST_NULLS);
MarkBufferDirty(nullbuffer);
END_CRIT_SECTION();
UnlockReleaseBuffer(metabuffer);
UnlockReleaseBuffer(rootbuffer);
UnlockReleaseBuffer(nullbuffer);
/*
* Now insert all the heap data into the index
*/
initSpGistState(&buildstate.spgstate, index);
buildstate.spgstate.isBuild = true;
buildstate.indtuples = 0;
buildstate.tmpCtx = AllocSetContextCreate(CurrentMemoryContext,
"SP-GiST build temporary context",
ALLOCSET_DEFAULT_SIZES);
reltuples = table_index_build_scan(heap, index, indexInfo, true, true,
spgistBuildCallback, (void *) &buildstate,
NULL);
MemoryContextDelete(buildstate.tmpCtx);
SpGistUpdateMetaPage(index);
/*
* We didn't write WAL records as we built the index, so if WAL-logging is
* required, write all pages to the WAL now.
*/
if (RelationNeedsWAL(index))
{
log_newpage_range(index, MAIN_FORKNUM,
0, RelationGetNumberOfBlocks(index),
true);
}
result = (IndexBuildResult *) palloc0(sizeof(IndexBuildResult));
result->heap_tuples = reltuples;
result->index_tuples = buildstate.indtuples;
return result;
}
/*
* Build an empty SPGiST index in the initialization fork
*/
void
spgbuildempty(Relation index)
{
Page page;
/* Construct metapage. */
page = (Page) palloc(BLCKSZ);
SpGistInitMetapage(page);
/*
* Write the page and log it unconditionally. This is important
* particularly for indexes created on tablespaces and databases whose
* creation happened after the last redo pointer as recovery removes any
* of their existing content when the corresponding create records are
* replayed.
*/
PageSetChecksumInplace(page, SPGIST_METAPAGE_BLKNO);
smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_METAPAGE_BLKNO,
(char *) page, true);
log_newpage(&(RelationGetSmgr(index))->smgr_rlocator.locator, INIT_FORKNUM,
SPGIST_METAPAGE_BLKNO, page, true);
/* Likewise for the root page. */
SpGistInitPage(page, SPGIST_LEAF);
PageSetChecksumInplace(page, SPGIST_ROOT_BLKNO);
smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_ROOT_BLKNO,
(char *) page, true);
log_newpage(&(RelationGetSmgr(index))->smgr_rlocator.locator, INIT_FORKNUM,
SPGIST_ROOT_BLKNO, page, true);
/* Likewise for the null-tuples root page. */
SpGistInitPage(page, SPGIST_LEAF | SPGIST_NULLS);
PageSetChecksumInplace(page, SPGIST_NULL_BLKNO);
smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_NULL_BLKNO,
(char *) page, true);
log_newpage(&(RelationGetSmgr(index))->smgr_rlocator.locator, INIT_FORKNUM,
SPGIST_NULL_BLKNO, page, true);
/*
* An immediate sync is required even if we xlog'd the pages, because the
* writes did not go through shared buffers and therefore a concurrent
* checkpoint may have moved the redo pointer past our xlog record.
*/
smgrimmedsync(RelationGetSmgr(index), INIT_FORKNUM);
}
/*
* Insert one new tuple into an SPGiST index.
*/
bool
spginsert(Relation index, Datum *values, bool *isnull,
ItemPointer ht_ctid, Relation heapRel,
IndexUniqueCheck checkUnique,
bool indexUnchanged,
IndexInfo *indexInfo)
{
SpGistState spgstate;
MemoryContext oldCtx;
MemoryContext insertCtx;
insertCtx = AllocSetContextCreate(CurrentMemoryContext,
"SP-GiST insert temporary context",
ALLOCSET_DEFAULT_SIZES);
oldCtx = MemoryContextSwitchTo(insertCtx);
initSpGistState(&spgstate, index);
/*
* We might have to repeat spgdoinsert() multiple times, if conflicts
* occur with concurrent insertions. If so, reset the insertCtx each time
* to avoid cumulative memory consumption. That means we also have to
* redo initSpGistState(), but it's cheap enough not to matter.
*/
while (!spgdoinsert(index, &spgstate, ht_ctid, values, isnull))
{
MemoryContextReset(insertCtx);
initSpGistState(&spgstate, index);
}
SpGistUpdateMetaPage(index);
MemoryContextSwitchTo(oldCtx);
MemoryContextDelete(insertCtx);
/* return false since we've not done any unique check */
return false;
}
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