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tcop

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    Tom Lane authored
    This reverts commit d573e239, "Take fewer
    snapshots".  While that seemed like a good idea at the time, it caused
    execution to use a snapshot that had been acquired before locking any of
    the tables mentioned in the query.  This created user-visible anomalies
    that were not present in any prior release of Postgres, as reported by
    Tomas Vondra.  While this whole area could do with a redesign (since there
    are related cases that have anomalies anyway), it doesn't seem likely that
    any future patch would be reasonably back-patchable; and we don't want 9.2
    to exhibit a behavior that's subtly unlike either past or future releases.
    Hence, revert to prior code while we rethink the problem.
    53299429
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