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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 commit4228817.Backpatch: 12-, just like commit4228817

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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
`@@ -7084,10 +7084,10 @@ heap_compute_xid_horizon_for_tuples(Relation rel,`
`7084`	`7084`	`xid_horizon_prefetch_buffer(rel,&prefetch_state,1);`
`7085`	`7085`	`#endif`
`7086`	`7086`
	`7087`	`+LockBuffer(buf,BUFFER_LOCK_SHARE);`
	`7088`	`+`
`7087`	`7089`	`page=BufferGetPage(buf);`
`7088`	`7090`	`maxoff=PageGetMaxOffsetNumber(page);`
`7089`		`-`
`7090`		`-LockBuffer(buf,BUFFER_LOCK_SHARE);`
`7091`	`7091`	`}`
`7092`	`7092`
`7093`	`7093`	`/*`

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Commit5f95664

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`‎src/backend/access/heap/heapam.c`

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