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This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
173 lines
5.1 KiB
SQL
173 lines
5.1 KiB
SQL
/* contrib/pg_trgm/pg_trgm--1.1.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION pg_trgm" to load this file. \quit
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CREATE FUNCTION set_limit(float4)
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RETURNS float4
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT VOLATILE;
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CREATE FUNCTION show_limit()
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RETURNS float4
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT STABLE;
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CREATE FUNCTION show_trgm(text)
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RETURNS _text
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT IMMUTABLE;
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CREATE FUNCTION similarity(text,text)
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RETURNS float4
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT IMMUTABLE;
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CREATE FUNCTION similarity_op(text,text)
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RETURNS bool
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT STABLE; -- stable because depends on trgm_limit
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CREATE OPERATOR % (
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LEFTARG = text,
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RIGHTARG = text,
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PROCEDURE = similarity_op,
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COMMUTATOR = '%',
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RESTRICT = contsel,
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JOIN = contjoinsel
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);
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CREATE FUNCTION similarity_dist(text,text)
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RETURNS float4
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT IMMUTABLE;
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CREATE OPERATOR <-> (
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LEFTARG = text,
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RIGHTARG = text,
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PROCEDURE = similarity_dist,
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COMMUTATOR = '<->'
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);
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-- gist key
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CREATE FUNCTION gtrgm_in(cstring)
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RETURNS gtrgm
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT;
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CREATE FUNCTION gtrgm_out(gtrgm)
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RETURNS cstring
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT;
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CREATE TYPE gtrgm (
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INTERNALLENGTH = -1,
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INPUT = gtrgm_in,
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OUTPUT = gtrgm_out
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);
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-- support functions for gist
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CREATE FUNCTION gtrgm_consistent(internal,text,int,oid,internal)
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RETURNS bool
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_distance(internal,text,int,oid)
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RETURNS float8
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_compress(internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_decompress(internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_penalty(internal,internal,internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_picksplit(internal, internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_union(bytea, internal)
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RETURNS _int4
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gtrgm_same(gtrgm, gtrgm, internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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-- create the operator class for gist
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CREATE OPERATOR CLASS gist_trgm_ops
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FOR TYPE text USING gist
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AS
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OPERATOR 1 % (text, text),
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FUNCTION 1 gtrgm_consistent (internal, text, int, oid, internal),
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FUNCTION 2 gtrgm_union (bytea, internal),
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FUNCTION 3 gtrgm_compress (internal),
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FUNCTION 4 gtrgm_decompress (internal),
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FUNCTION 5 gtrgm_penalty (internal, internal, internal),
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FUNCTION 6 gtrgm_picksplit (internal, internal),
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FUNCTION 7 gtrgm_same (gtrgm, gtrgm, internal),
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STORAGE gtrgm;
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-- Add operators and support functions that are new in 9.1. We do it like
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-- this, leaving them "loose" in the operator family rather than bound into
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-- the gist_trgm_ops opclass, because that's the only state that can be
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-- reproduced during an upgrade from 9.0 (see pg_trgm--unpackaged--1.0.sql).
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ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
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OPERATOR 2 <-> (text, text) FOR ORDER BY pg_catalog.float_ops,
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OPERATOR 3 pg_catalog.~~ (text, text),
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OPERATOR 4 pg_catalog.~~* (text, text),
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FUNCTION 8 (text, text) gtrgm_distance (internal, text, int, oid);
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-- support functions for gin
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CREATE FUNCTION gin_extract_value_trgm(text, internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gin_extract_query_trgm(text, internal, int2, internal, internal, internal, internal)
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RETURNS internal
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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CREATE FUNCTION gin_trgm_consistent(internal, int2, text, int4, internal, internal, internal, internal)
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RETURNS bool
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AS 'MODULE_PATHNAME'
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LANGUAGE C IMMUTABLE STRICT;
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-- create the operator class for gin
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CREATE OPERATOR CLASS gin_trgm_ops
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FOR TYPE text USING gin
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AS
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OPERATOR 1 % (text, text),
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FUNCTION 1 btint4cmp (int4, int4),
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FUNCTION 2 gin_extract_value_trgm (text, internal),
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FUNCTION 3 gin_extract_query_trgm (text, internal, int2, internal, internal, internal, internal),
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FUNCTION 4 gin_trgm_consistent (internal, int2, text, int4, internal, internal, internal, internal),
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STORAGE int4;
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-- Add operators that are new in 9.1.
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ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
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OPERATOR 3 pg_catalog.~~ (text, text),
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OPERATOR 4 pg_catalog.~~* (text, text);
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-- Add operators that are new in 9.3.
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ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
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OPERATOR 5 pg_catalog.~ (text, text),
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OPERATOR 6 pg_catalog.~* (text, text);
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