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Add GIN support for pg_trgm. From Guillaume Smet <guillaume.smet@gmail.com>
with minor editorization by me.
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‎contrib/pg_trgm/Makefile

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# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.6 2007/02/09 17:24:33 petere Exp $
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# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.7 2007/03/14 14:15:40 teodor Exp $
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MODULE_big = pg_trgm
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OBJS = trgm_op.o trgm_gist.o
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OBJS = trgm_op.o trgm_gist.o trgm_gin.o
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DATA_built = pg_trgm.sql
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DATA = uninstall_pg_trgm.sql

‎contrib/pg_trgm/README.pg_trgm

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Next, create a trigram index on the word column:
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CREATE INDEX words_idx ON words USING gist(word gist_trgm_ops);
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or
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CREATE INDEX words_idx ON words USING gin(word gist_trgm_ops);
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Now, a SELECT query similar to the example above can be used to
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suggest spellings for misspelled words in user search terms. A

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