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Improve the gin index scan performance in pg_trgm.

Teodor Sigaev <teodor@sigaev.ru>

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Commit: 25bfa7efd037a3c44d6a2989d18f55758090e8a9
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2015-12-25T10:05:13Z
Releases: 9.6.0 
Improve the gin index scan performance in pg_trgm.

Previous coding assumes too pessimistic upper bound of similarity
in consistent method of GIN.

Author: Fornaroli Christophe with comments by me.

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contrib/pg_trgm/trgm_gin.c modified +20 −8