Update extensions with GIN/GIST support for parallel query.

Commit 749a787c5b25ae33b3d4da0ef12aa05214aa73c7 bumped the extension
version on all of these extensions already, and we haven't had a
release since then, so we can make further changes without bumping the
extension version again.  Take this opportunity to mark all of the
functions exported by these modules PARALLEL SAFE -- except for
pg_trgm's set_limit().  Mark that one PARALLEL RESTRICTED, because it
makes a persistent change to a GUC value.

Note that some of the markings added by this commit don't have any
effect; for example, gseg_picksplit() isn't likely to be mentioned
explicitly in a query and therefore it's parallel-safety marking will
never be consulted.  But this commit just marks everything for
consistency: if it were somehow used in a query, that would be fine as
far as parallel query is concerned, since it does not consult any
backend-private state, attempt to write data, etc.

Andreas Karlsson, with a few revisions by me.

2 files changed, 141 insertions, 70 deletions

diff --git a/contrib/ltree/ltree--1.0--1.1.sql b/contrib/ltree/ltree--1.0--1.1.sql
index 7fe61d1c25a..155751aa3a8 100644
--- a/contrib/ltree/ltree--1.0--1.1.sql
+++ b/contrib/ltree/ltree--1.0--1.1.sql
@@ -27,3 +27,74 @@ WHERE oid = pg_catalog.to_regprocedure('ltree_union(internal,internal)');
 UPDATE pg_catalog.pg_proc SET
   prorettype = 'ltree_gist'::pg_catalog.regtype
 WHERE oid = pg_catalog.to_regprocedure('_ltree_union(internal,internal)');
+
+ALTER FUNCTION ltree_in(cstring) PARALLEL SAFE;
+ALTER FUNCTION ltree_out(ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_cmp(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_lt(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_le(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_eq(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_ge(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_gt(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_ne(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION subltree(ltree, int4, int4) PARALLEL SAFE;
+ALTER FUNCTION subpath(ltree, int4, int4) PARALLEL SAFE;
+ALTER FUNCTION subpath(ltree, int4) PARALLEL SAFE;
+ALTER FUNCTION index(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION index(ltree, ltree, int4) PARALLEL SAFE;
+ALTER FUNCTION nlevel(ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree2text(ltree) PARALLEL SAFE;
+ALTER FUNCTION text2ltree(text) PARALLEL SAFE;
+ALTER FUNCTION lca(_ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree, ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree, ltree, ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION lca(ltree, ltree, ltree, ltree, ltree, ltree, ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_isparent(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_risparent(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_addltree(ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_addtext(ltree, text) PARALLEL SAFE;
+ALTER FUNCTION ltree_textadd(text, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltreeparentsel(internal, oid, internal, integer) PARALLEL SAFE;
+ALTER FUNCTION lquery_in(cstring) PARALLEL SAFE;
+ALTER FUNCTION lquery_out(lquery) PARALLEL SAFE;
+ALTER FUNCTION ltq_regex(ltree, lquery) PARALLEL SAFE;
+ALTER FUNCTION ltq_rregex(lquery, ltree) PARALLEL SAFE;
+ALTER FUNCTION lt_q_regex(ltree, _lquery) PARALLEL SAFE;
+ALTER FUNCTION lt_q_rregex(_lquery, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltxtq_in(cstring) PARALLEL SAFE;
+ALTER FUNCTION ltxtq_out(ltxtquery) PARALLEL SAFE;
+ALTER FUNCTION ltxtq_exec(ltree, ltxtquery) PARALLEL SAFE;
+ALTER FUNCTION ltxtq_rexec(ltxtquery, ltree) PARALLEL SAFE;
+ALTER FUNCTION ltree_gist_in(cstring) PARALLEL SAFE;
+ALTER FUNCTION ltree_gist_out(ltree_gist) PARALLEL SAFE;
+ALTER FUNCTION ltree_consistent(internal, ltree, int2, oid, internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_compress(internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_decompress(internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_penalty(internal, internal, internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_picksplit(internal, internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_union(internal, internal) PARALLEL SAFE;
+ALTER FUNCTION ltree_same(ltree_gist, ltree_gist, internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_isparent(_ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltree_r_isparent(ltree, _ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltree_risparent(_ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltree_r_risparent(ltree, _ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltq_regex(_ltree, lquery) PARALLEL SAFE;
+ALTER FUNCTION _ltq_rregex(lquery, _ltree) PARALLEL SAFE;
+ALTER FUNCTION _lt_q_regex(_ltree, _lquery) PARALLEL SAFE;
+ALTER FUNCTION _lt_q_rregex(_lquery, _ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltxtq_exec(_ltree, ltxtquery) PARALLEL SAFE;
+ALTER FUNCTION _ltxtq_rexec(ltxtquery, _ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltree_extract_isparent(_ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltree_extract_risparent(_ltree, ltree) PARALLEL SAFE;
+ALTER FUNCTION _ltq_extract_regex(_ltree, lquery) PARALLEL SAFE;
+ALTER FUNCTION _ltxtq_extract_exec(_ltree, ltxtquery) PARALLEL SAFE;
+ALTER FUNCTION _ltree_consistent(internal, _ltree, int2, oid, internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_compress(internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_penalty(internal, internal, internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_picksplit(internal, internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_union(internal, internal) PARALLEL SAFE;
+ALTER FUNCTION _ltree_same(ltree_gist, ltree_gist, internal) PARALLEL SAFE;
diff --git a/contrib/ltree/ltree--1.1.sql b/contrib/ltree/ltree--1.1.sql
index 1e04ce64898..d46f5fcd02e 100644
--- a/contrib/ltree/ltree--1.1.sql
+++ b/contrib/ltree/ltree--1.1.sql
@@ -6,12 +6,12 @@
 CREATE FUNCTION ltree_in(cstring)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_out(ltree)
 RETURNS cstring
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE TYPE ltree (
 	INTERNALLENGTH = -1,
@@ -25,37 +25,37 @@ CREATE TYPE ltree (
 CREATE FUNCTION ltree_cmp(ltree,ltree)
 RETURNS int4
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_lt(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_le(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_eq(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_ge(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_gt(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_ne(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 
 CREATE OPERATOR < (
@@ -125,112 +125,112 @@ CREATE OPERATOR <> (
 CREATE FUNCTION subltree(ltree,int4,int4)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION subpath(ltree,int4,int4)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION subpath(ltree,int4)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION index(ltree,ltree)
 RETURNS int4
 AS 'MODULE_PATHNAME', 'ltree_index'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION index(ltree,ltree,int4)
 RETURNS int4
 AS 'MODULE_PATHNAME', 'ltree_index'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION nlevel(ltree)
 RETURNS int4
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree2text(ltree)
 RETURNS text
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION text2ltree(text)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(_ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME','_lca'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree,ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree,ltree,ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lca(ltree,ltree,ltree,ltree,ltree,ltree,ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_isparent(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_risparent(ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_addltree(ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_addtext(ltree,text)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_textadd(text,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltreeparentsel(internal, oid, internal, integer)
 RETURNS float8
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR @> (
         LEFTARG = ltree,
@@ -303,12 +303,12 @@ CREATE OPERATOR CLASS ltree_ops
 CREATE FUNCTION lquery_in(cstring)
 RETURNS lquery
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lquery_out(lquery)
 RETURNS cstring
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE TYPE lquery (
 	INTERNALLENGTH = -1,
@@ -320,12 +320,12 @@ CREATE TYPE lquery (
 CREATE FUNCTION ltq_regex(ltree,lquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltq_rregex(lquery,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ~ (
         LEFTARG = ltree,
@@ -367,12 +367,12 @@ CREATE OPERATOR ^~ (
 CREATE FUNCTION lt_q_regex(ltree,_lquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION lt_q_rregex(_lquery,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ? (
         LEFTARG = ltree,
@@ -414,12 +414,12 @@ CREATE OPERATOR ^? (
 CREATE FUNCTION ltxtq_in(cstring)
 RETURNS ltxtquery
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltxtq_out(ltxtquery)
 RETURNS cstring
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE TYPE ltxtquery (
 	INTERNALLENGTH = -1,
@@ -433,12 +433,12 @@ CREATE TYPE ltxtquery (
 CREATE FUNCTION ltxtq_exec(ltree, ltxtquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltxtq_rexec(ltxtquery, ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR @ (
         LEFTARG = ltree,
@@ -481,12 +481,12 @@ CREATE OPERATOR ^@ (
 CREATE FUNCTION ltree_gist_in(cstring)
 RETURNS ltree_gist
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION ltree_gist_out(ltree_gist)
 RETURNS cstring
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE TYPE ltree_gist (
 	internallength = -1,
@@ -497,25 +497,25 @@ CREATE TYPE ltree_gist (
 
 
 CREATE FUNCTION ltree_consistent(internal,ltree,int2,oid,internal)
-RETURNS bool as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS bool as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_compress(internal)
-RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_decompress(internal)
-RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_penalty(internal,internal,internal)
-RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_picksplit(internal, internal)
-RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_union(internal, internal)
-RETURNS ltree_gist as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS ltree_gist as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION ltree_same(ltree_gist, ltree_gist, internal)
-RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+RETURNS internal as 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE OPERATOR CLASS gist_ltree_ops
     DEFAULT FOR TYPE ltree USING gist AS
@@ -547,52 +547,52 @@ CREATE OPERATOR CLASS gist_ltree_ops
 CREATE FUNCTION _ltree_isparent(_ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_r_isparent(ltree,_ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_risparent(_ltree,ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_r_risparent(ltree,_ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltq_regex(_ltree,lquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltq_rregex(lquery,_ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _lt_q_regex(_ltree,_lquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _lt_q_rregex(_lquery,_ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltxtq_exec(_ltree, ltxtquery)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE FUNCTION _ltxtq_rexec(ltxtquery, _ltree)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR @> (
         LEFTARG = _ltree,
@@ -780,7 +780,7 @@ CREATE OPERATOR ^@ (
 CREATE FUNCTION _ltree_extract_isparent(_ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ?@> (
         LEFTARG = _ltree,
@@ -791,7 +791,7 @@ CREATE OPERATOR ?@> (
 CREATE FUNCTION _ltree_extract_risparent(_ltree,ltree)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ?<@ (
         LEFTARG = _ltree,
@@ -802,7 +802,7 @@ CREATE OPERATOR ?<@ (
 CREATE FUNCTION _ltq_extract_regex(_ltree,lquery)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ?~ (
         LEFTARG = _ltree,
@@ -813,7 +813,7 @@ CREATE OPERATOR ?~ (
 CREATE FUNCTION _ltxtq_extract_exec(_ltree,ltxtquery)
 RETURNS ltree
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT IMMUTABLE;
+LANGUAGE C STRICT IMMUTABLE PARALLEL SAFE;
 
 CREATE OPERATOR ?@ (
         LEFTARG = _ltree,
@@ -825,32 +825,32 @@ CREATE OPERATOR ?@ (
 CREATE FUNCTION _ltree_consistent(internal,_ltree,int2,oid,internal)
 RETURNS bool
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_compress(internal)
 RETURNS internal
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_penalty(internal,internal,internal)
 RETURNS internal
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_picksplit(internal, internal)
 RETURNS internal
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_union(internal, internal)
 RETURNS ltree_gist
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION _ltree_same(ltree_gist, ltree_gist, internal)
 RETURNS internal
 AS 'MODULE_PATHNAME'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE OPERATOR CLASS gist__ltree_ops
     DEFAULT FOR TYPE _ltree USING gist AS