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Fix tuple counting in SP-GiST index build.

Count the number of tuples in the index honestly, instead of assumingthat it's the same as the number of tuples in the heap. (It might bedifferent if the index is partial.)Back-patch to all supported versions.Tomas VondraDiscussion:https://postgr.es/m/3b3d8eac-c709-0d25-088e-b98339a1b28a@2ndquadrant.com

1 parent7de4a1b commit649f179Copy full SHA for 649f179

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src/backend/access/spgist
- spginsert.c

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`‎src/backend/access/spgist/spginsert.c`

Lines changed: 7 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -32,6 +32,7 @@`
`32`	`32`	`typedefstruct`
`33`	`33`	`{`
`34`	`34`	`SpGistStatespgstate;/* SPGiST's working state */`
	`35`	`+int64indtuples;/* total number of tuples indexed */`
`35`	`36`	`MemoryContexttmpCtx;/* per-tuple temporary context */`
`36`	`37`	`}SpGistBuildState;`
`37`	`38`
`@@ -59,6 +60,9 @@ spgistBuildCallback(Relation index, HeapTuple htup, Datum *values,`
`59`	`60`	`MemoryContextReset(buildstate->tmpCtx);`
`60`	`61`	`}`
`61`	`62`
	`63`	`+/* Update total tuple count */`
	`64`	`+buildstate->indtuples+=1;`
	`65`	`+`
`62`	`66`	`MemoryContextSwitchTo(oldCtx);`
`63`	`67`	`MemoryContextReset(buildstate->tmpCtx);`
`64`	`68`	`}`
`@@ -132,6 +136,7 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)`
`132`	`136`	`*/`
`133`	`137`	`initSpGistState(&buildstate.spgstate,index);`
`134`	`138`	`buildstate.spgstate.isBuild= true;`
	`139`	`+buildstate.indtuples=0;`
`135`	`140`
`136`	`141`	`buildstate.tmpCtx=AllocSetContextCreate(CurrentMemoryContext,`
`137`	`142`	`"SP-GiST build temporary context",`
`@@ -146,7 +151,8 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)`
`146`	`151`	`SpGistUpdateMetaPage(index);`
`147`	`152`
`148`	`153`	`result= (IndexBuildResult*)palloc0(sizeof(IndexBuildResult));`
`149`		`-result->heap_tuples=result->index_tuples=reltuples;`
	`154`	`+result->heap_tuples=reltuples;`
	`155`	`+result->index_tuples=buildstate.indtuples;`
`150`	`156`
`151`	`157`	`returnresult;`
`152`	`158`	`}`

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`‎src/backend/access/spgist/spginsert.c`

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