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Commit 493f7260 authored by Tom Lane's avatar Tom Lane
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Renumber SnapshotNow and the other special snapshot codes so that

((Snapshot) NULL) can no longer be confused with a valid snapshot,
as per my recent suggestion.  Define a macro InvalidSnapshot for 0.
Use InvalidSnapshot instead of SnapshotAny as the do-nothing special
case for heap_update and heap_delete crosschecks; this seems a little
cleaner even though the behavior is really the same.
parent 9835944e
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