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Fix hot standby bug with GiST scans.

Don't reset the rightlink of a page when replaying a page update record.This was a leftover from pre-hot standby days, when it was not possible tohave scans concurrent with WAL replay. Resetting the right-link was notnecessary back then either, but it was done for the sake of tidiness. Butwith hot standby, it's wrong, because a concurrent scan might still need it.Backpatch all versions with hot standby, 9.0 and above.

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src/backend/access/gist
- gistxlog.c

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`‎src/backend/access/gist/gistxlog.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -182,7 +182,6 @@ gistRedoPageUpdateRecord(XLogRecPtr lsn, XLogRecord *record)`
`182`	`182`	`GistPageSetLeaf(page);`
`183`	`183`	`}`
`184`	`184`
`185`		`-GistPageGetOpaque(page)->rightlink=InvalidBlockNumber;`
`186`	`185`	`PageSetLSN(page,lsn);`
`187`	`186`	`MarkBufferDirty(buffer);`
`188`	`187`	`UnlockReleaseBuffer(buffer);`

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Commit601c01e

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`‎src/backend/access/gist/gistxlog.c‎`

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