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Viewing changes to src/backend/utils/time/tqual.c

  • Committer: Bazaar Package Importer
  • Author(s): Martin Pitt
  • Date: 2011-06-14 09:53:29 UTC
  • mto: (6.1.1 sid) (10.1.1 oneiric-proposed) (1.2.1)
  • mto: This revision was merged to the branch mainline in revision 5.
  • Revision ID: james.westby@ubuntu.com-20110614095329-71gfhjywyp2c27au
Tags: upstream-9.1~beta2
Import upstream version 9.1~beta2

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src/backend/utils/time/tqual.c
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        }
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        /*
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         * Deleter committed, but check special cases.
 
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         * Deleter committed, but perhaps it was recent enough that some open
 
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         * transactions could still see the tuple.
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         */
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        if (TransactionIdEquals(HeapTupleHeaderGetXmin(tuple),
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                                                        HeapTupleHeaderGetXmax(tuple)))
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        {
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                /*
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                 * Inserter also deleted it, so it was never visible to anyone else.
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                 * However, we can only remove it early if it's not an updated tuple;
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                 * else its parent tuple is linking to it via t_ctid, and this tuple
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                 * mustn't go away before the parent does.
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                 */
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                if (!(tuple->t_infomask & HEAP_UPDATED))
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                        return HEAPTUPLE_DEAD;
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        }
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        if (!TransactionIdPrecedes(HeapTupleHeaderGetXmax(tuple), OldestXmin))
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        {
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                /* deleting xact is too recent, tuple could still be visible */
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                return HEAPTUPLE_RECENTLY_DEAD;
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        }
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        /* Otherwise, it's dead and removable */
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        return HEAPTUPLE_DEAD;