Commit 45ba424

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Cache the results of ri_FetchConstraintInfo in a backend-local cache.

Extracting data from pg_constraint turned out to take as much as 10% of the runtime in a bulk-update case where the foreign key column wasn't changing, because we did it over again for each tuple. Fix that by maintaining a backend-local cache of the results. This is really a pretty small patch, but converting the trigger functions to work with pointers rather than local struct variables requires a lot of mechanical changes.

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src/backend/utils/adt
- ri_triggers.c

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