postgresql/contrib/pg_trgm/pg_trgm--1.1--1.2.sql
Teodor Sigaev f576b17cd6 Add word_similarity to pg_trgm contrib module.
Patch introduces a concept of similarity over string and just a word from
another string.

Version of extension is not changed because 1.2 was already introduced in 9.6
release cycle, so, there wasn't a public version.

Author: Alexander Korotkov, Artur Zakirov
2016-03-16 18:59:21 +03:00

75 lines
2.1 KiB
SQL

/* contrib/pg_trgm/pg_trgm--1.1--1.2.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_trgm UPDATE TO '1.2'" to load this file. \quit
CREATE FUNCTION word_similarity(text,text)
RETURNS float4
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT IMMUTABLE;
CREATE FUNCTION word_similarity_op(text,text)
RETURNS bool
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
CREATE FUNCTION word_similarity_commutator_op(text,text)
RETURNS bool
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
CREATE FUNCTION word_similarity_dist_op(text,text)
RETURNS float4
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT IMMUTABLE;
CREATE FUNCTION word_similarity_dist_commutator_op(text,text)
RETURNS float4
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT IMMUTABLE;
CREATE OPERATOR <% (
LEFTARG = text,
RIGHTARG = text,
PROCEDURE = word_similarity_op,
COMMUTATOR = '%>',
RESTRICT = contsel,
JOIN = contjoinsel
);
CREATE OPERATOR %> (
LEFTARG = text,
RIGHTARG = text,
PROCEDURE = word_similarity_commutator_op,
COMMUTATOR = '<%',
RESTRICT = contsel,
JOIN = contjoinsel
);
CREATE OPERATOR <<-> (
LEFTARG = text,
RIGHTARG = text,
PROCEDURE = word_similarity_dist_op,
COMMUTATOR = '<->>'
);
CREATE OPERATOR <->> (
LEFTARG = text,
RIGHTARG = text,
PROCEDURE = word_similarity_dist_commutator_op,
COMMUTATOR = '<<->'
);
CREATE FUNCTION gin_trgm_triconsistent(internal, int2, text, int4, internal, internal, internal)
RETURNS "char"
AS 'MODULE_PATHNAME'
LANGUAGE C IMMUTABLE STRICT;
ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
OPERATOR 7 %> (text, text),
OPERATOR 8 <->> (text, text) FOR ORDER BY pg_catalog.float_ops;
ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
OPERATOR 7 %> (text, text),
FUNCTION 6 (text, text) gin_trgm_triconsistent (internal, int2, text, int4, internal, internal, internal);