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c426f7c2b3
A REINDEX CONCURRENTLY run on a table with no indexes would always pop
the topmost snapshot from the active snapshot stack, making the snapshot
handling inconsistent between the multiple-relation and single-relation
cases. This commit slightly changes the snapshot stack handling so as a
snapshot is popped only ReindexMultipleInternal() in this case after a
relation has been reindexed, fixing a problem where an event trigger
function may need a snapshot but does not have one. This also keeps the
places where PopActiveSnapshot() is called closer to each other.
While on it, this expands the existing tests to cover all the cases that
could be faced with REINDEX commands and such event triggers, for one or
more relations, with or without indexes.
This behavior is inconsistent since
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