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Commit293ec33

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Remove bogus comment from HeapTupleSatisfiesNow.
This has been wrong for a really long time. We don't use two-phaselocking to protect against serialization anomalies.Per discussion on pgsql-hackers about 2011-03-07; original reportby Dan Ports.
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‎src/backend/utils/time/tqual.c

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@@ -323,16 +323,6 @@ HeapTupleSatisfiesSelf(HeapTupleHeader tuple, Snapshot snapshot, Buffer buffer)
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* (Xmax != my-transaction &&the row was deleted by another transaction
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* Xmax is not committed))))that has not been committed
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*
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*mao says 17 march 1993: the tests in this routine are correct;
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*if you think they're not, you're wrong, and you should think
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*about it again. i know, it happened to me. we don't need to
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*check commit time against the start time of this transaction
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*because 2ph locking protects us from doing the wrong thing.
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*if you mess around here, you'll break serializability. the only
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*problem with this code is that it does the wrong thing for system
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*catalog updates, because the catalogs aren't subject to 2ph, so
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*the serializability guarantees we provide don't extend to xacts
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*that do catalog accesses. this is unfortunate, but not critical.
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*/
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bool
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HeapTupleSatisfiesNow(HeapTupleHeadertuple,Snapshotsnapshot,Bufferbuffer)

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