trgm - Trigram matching for PostgreSQL

--------------------------------------

	The pg_trgm contrib module provides functions and index classes
	for determining the similarity of text based on trigram
	matching.

1 files changed, 107 insertions, 0 deletions

diff --git a/contrib/pg_trgm/pg_trgm.sql.in b/contrib/pg_trgm/pg_trgm.sql.in
new file mode 100644
index 0000000000..f38abb6e48
--- /dev/null
+++ b/contrib/pg_trgm/pg_trgm.sql.in
@@ -0,0 +1,107 @@
+SET search_path = public;
+
+BEGIN;
+
+create function set_limit(float4)
+returns float4
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict,iscachable);
+
+create function show_limit()
+returns float4
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict,iscachable);
+
+create function show_trgm(text)
+returns _text
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict,iscachable);
+
+create function similarity(text,text)
+returns float4
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict,iscachable);
+
+create function similarity_op(text,text)
+returns bool
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict,iscachable);
+
+CREATE OPERATOR % (
+        LEFTARG = text,
+        RIGHTARG = text,
+        PROCEDURE = similarity_op,
+        COMMUTATOR = '%',
+        RESTRICT = contsel,
+        JOIN = contjoinsel
+);
+
+--gist key
+CREATE FUNCTION gtrgm_in(cstring)
+RETURNS gtrgm
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict);
+
+CREATE FUNCTION gtrgm_out(gtrgm)
+RETURNS cstring
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict);
+
+CREATE TYPE gtrgm (
+        INTERNALLENGTH = -1,
+        INPUT = gtrgm_in,
+        OUTPUT = gtrgm_out
+);
+
+-- support functions
+CREATE FUNCTION gtrgm_consistent(gtrgm,internal,int4)
+RETURNS bool
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+ 
+CREATE FUNCTION gtrgm_compress(internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+
+CREATE FUNCTION gtrgm_decompress(internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+
+CREATE FUNCTION gtrgm_penalty(internal,internal,internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C' with (isstrict);
+
+CREATE FUNCTION gtrgm_picksplit(internal, internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+
+CREATE FUNCTION gtrgm_union(bytea, internal)
+RETURNS _int4
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+
+CREATE FUNCTION gtrgm_same(gtrgm, gtrgm, internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE 'C';
+
+-- create the operator class
+CREATE OPERATOR CLASS gist_trgm_ops
+FOR TYPE text USING gist
+AS
+        OPERATOR        1       % (text, text),
+        FUNCTION        1       gtrgm_consistent (gtrgm, internal, int4),
+        FUNCTION        2       gtrgm_union (bytea, internal),
+        FUNCTION        3       gtrgm_compress (internal),
+        FUNCTION        4       gtrgm_decompress (internal),
+        FUNCTION        5       gtrgm_penalty (internal, internal, internal),
+        FUNCTION        6       gtrgm_picksplit (internal, internal),
+        FUNCTION        7       gtrgm_same (gtrgm, gtrgm, internal),
+        STORAGE         gtrgm;
+
+
+COMMIT;