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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 really matter, but doing it this way is cleaner. Follow-up to commit42288174
. Backpatch: 12-, just like commit42288174
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@ -7084,10 +7084,10 @@ heap_compute_xid_horizon_for_tuples(Relation rel,
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xid_horizon_prefetch_buffer(rel, &prefetch_state, 1);
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#endif
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LockBuffer(buf, BUFFER_LOCK_SHARE);
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page = BufferGetPage(buf);
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maxoff = PageGetMaxOffsetNumber(page);
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LockBuffer(buf, BUFFER_LOCK_SHARE);
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}
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/*
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