pgsql: Avoid CREATE INDEX unique index deduplication.

2020-07-17 Thread Peter Geoghegan
Avoid CREATE INDEX unique index deduplication. There is no advantage to attempting deduplication for a unique index during CREATE INDEX, since there cannot possibly be any duplicates. Doing so wastes cycles due to unnecessary copying. Make sure that we avoid it consistently. We already avoided u

pgsql: Avoid CREATE INDEX unique index deduplication.

2020-07-17 Thread Peter Geoghegan
Avoid CREATE INDEX unique index deduplication. There is no advantage to attempting deduplication for a unique index during CREATE INDEX, since there cannot possibly be any duplicates. Doing so wastes cycles due to unnecessary copying. Make sure that we avoid it consistently. We already avoided u