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Store the deletion horizon XID for a deleted GIN page on the right page.

Commitb107140 moved the GinPageSetDeleteXid() call to a spot wherethe "page" variable was pointing to the wrong page, causing the XIDto be inserted on a page that's not being deleted, thus allowing laterGinPageIsRecyclable tests to recycle the deleted page too soon.It might be a good idea to stop using the single "page" variable formultiple purposes in this function. But for the moment I just movedthe GinPageSetDeleteXid() call down beside the GinPageSetDeleted()call, which seems like a more logical place for it anyway.Back-patch to v11, as the faulty patch was. (Fortunately, the bughasn't made it into any release yet.)Discussion:https://postgr.es/m/21620.1581098806@sss.pgh.pa.us

1 parent0d233f4 commitf91706bCopy full SHA for f91706b

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src/backend/access/gin
- ginvacuum.c

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`‎src/backend/access/gin/ginvacuum.c‎`

Lines changed: 6 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -165,9 +165,6 @@ ginDeletePage(GinVacuumState *gvs, BlockNumber deleteBlkno, BlockNumber leftBlkn`
`165`	`165`	`page=BufferGetPage(lBuffer);`
`166`	`166`	`GinPageGetOpaque(page)->rightlink=rightlink;`
`167`	`167`
`168`		`-/* For deleted page remember last xid which could knew its address */`
`169`		`-GinPageSetDeleteXid(page,ReadNewTransactionId());`
`170`		`-`
`171`	`168`	`/* Delete downlink from parent */`
`172`	`169`	`parentPage=BufferGetPage(pBuffer);`
`173`	`170`	`#ifdefUSE_ASSERT_CHECKING`
`@@ -186,7 +183,13 @@ ginDeletePage(GinVacuumState *gvs, BlockNumber deleteBlkno, BlockNumber leftBlkn`
`186`	`183`	`* we shouldn't change rightlink field to save workability of running`
`187`	`184`	`* search scan`
`188`	`185`	`*/`
	`186`	`+`
	`187`	`+/*`
	`188`	`+ * Mark page as deleted, and remember last xid which could know its`
	`189`	`+ * address.`
	`190`	`+ */`
`189`	`191`	`GinPageSetDeleted(page);`
	`192`	`+GinPageSetDeleteXid(page,ReadNewTransactionId());`
`190`	`193`
`191`	`194`	`MarkBufferDirty(pBuffer);`
`192`	`195`	`MarkBufferDirty(lBuffer);`

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Commitf91706b

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`‎src/backend/access/gin/ginvacuum.c‎`

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