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Get heap page max offset with buffer lock held.

On further reflection it seems better to call PageGetMaxOffsetNumber()after acquiring a buffer lock on the page. This shouldn't reallymatter, but doing it this way is cleaner.Follow-up to commit 42288174.Backpatch: 12-, just like commit 42288174

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src/backend/access/heap
- heapam.c

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`‎src/backend/access/heap/heapam.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -7042,10 +7042,10 @@ heap_compute_xid_horizon_for_tuples(Relation rel,`
`7042`	`7042`	`xid_horizon_prefetch_buffer(rel,&prefetch_state,1);`
`7043`	`7043`	`#endif`
`7044`	`7044`
	`7045`	`+LockBuffer(buf,BUFFER_LOCK_SHARE);`
	`7046`	`+`
`7045`	`7047`	`page=BufferGetPage(buf);`
`7046`	`7048`	`maxoff=PageGetMaxOffsetNumber(page);`
`7047`		`-`
`7048`		`-LockBuffer(buf,BUFFER_LOCK_SHARE);`
`7049`	`7049`	`}`
`7050`	`7050`
`7051`	`7051`	`/*`

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Commit55e5352

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`‎src/backend/access/heap/heapam.c`

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