Fix HeapTupleSatisfiesVacuum on aborted updater xacts
By using only the macro that checks infomask bits HEAP_XMAX_IS_LOCKED_ONLY to verify whether a multixact is not an updater, and not the full HeapTupleHeaderIsOnlyLocked, it would come to the wrong result in case of a multixact containing an aborted update; therefore returning the wrong result code. This would cause predicate.c to break completely (as in bug report #8273 from David Leverton), and certain index builds would misbehave. As far as I can tell, other callers of the bogus routine would make harmless mistakes or not be affected by the difference at all; so this was a pretty narrow case. Also, no other user of the HEAP_XMAX_IS_LOCKED_ONLY macro is as careless; they all check specifically for the HEAP_XMAX_IS_MULTI case, and they all verify whether the updater is InvalidXid before concluding that it's a valid updater. So there doesn't seem to be any similar bug.
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@ -1287,7 +1287,9 @@ HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId OldestXmin,
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{
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if (tuple->t_infomask & HEAP_XMAX_INVALID) /* xid invalid */
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return HEAPTUPLE_INSERT_IN_PROGRESS;
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if (HEAP_XMAX_IS_LOCKED_ONLY(tuple->t_infomask))
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/* only locked? run infomask-only check first, for performance */
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if (HEAP_XMAX_IS_LOCKED_ONLY(tuple->t_infomask) ||
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HeapTupleHeaderIsOnlyLocked(tuple))
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return HEAPTUPLE_INSERT_IN_PROGRESS;
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/* inserted and then deleted by same xact */
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return HEAPTUPLE_DELETE_IN_PROGRESS;
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