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key, compare the new and old row versions. If the foreign key column has not changed, we needn't enqueue the trigger, since the update cannot violate the foreign key. This optimization was previously applied in the RI trigger function, but it is more efficient to avoid firing the trigger altogether. Per recent discussion on pgsql-hackers. Also add a regression test for some unintuitive foreign key behavior, and refactor some code that deals with the OIDs of the various RI trigger functions. |
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