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Fix tuple counting in SP-GiST index build.

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Count the number of tuples in the index honestly, instead of assuming
that it's the same as the number of tuples in the heap.  (It might be
different if the index is partial.)

Back-patch to all supported versions.

Tomas Vondra

Discussion: https://postgr.es/m/3b3d8eac-c709-0d25-088e-b98339a1b28a@2ndquadrant.com
This commit is contained in:
Tom Lane 2018-03-22 13:23:47 -04:00
parent 7de4a1bcc5
commit 649f179250
1 changed files with 7 additions and 1 deletions
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8
src/backend/access/spgist/spginsert.c
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@ -32,6 +32,7 @@
typedef struct
{
SpGistState spgstate; /* SPGiST's working state */
int64 indtuples; /* total number of tuples indexed */
MemoryContext tmpCtx; /* per-tuple temporary context */
} SpGistBuildState;
@ -59,6 +60,9 @@ spgistBuildCallback(Relation index, HeapTuple htup, Datum *values,
MemoryContextReset(buildstate->tmpCtx);
}
/* Update total tuple count */
buildstate->indtuples += 1;
MemoryContextSwitchTo(oldCtx);
MemoryContextReset(buildstate->tmpCtx);
}
@ -132,6 +136,7 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
*/
initSpGistState(&buildstate.spgstate, index);
buildstate.spgstate.isBuild = true;
buildstate.indtuples = 0;
buildstate.tmpCtx = AllocSetContextCreate(CurrentMemoryContext,
"SP-GiST build temporary context",
@ -146,7 +151,8 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
SpGistUpdateMetaPage(index);
result = (IndexBuildResult *) palloc0(sizeof(IndexBuildResult));
result->heap_tuples = result->index_tuples = reltuples;
result->heap_tuples = reltuples;
result->index_tuples = buildstate.indtuples;
return result;
}