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/usr/share/postgresql/10/extension/citext--1.1--1.2.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.

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/* contrib/citext/citext--1.1--1.2.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION citext UPDATE TO '1.2'" to load this file. \quit

ALTER FUNCTION citextin(cstring) PARALLEL SAFE;
ALTER FUNCTION citextout(citext) PARALLEL SAFE;
ALTER FUNCTION citextrecv(internal) PARALLEL SAFE;
ALTER FUNCTION citextsend(citext) PARALLEL SAFE;
ALTER FUNCTION citext(bpchar) PARALLEL SAFE;
ALTER FUNCTION citext(boolean) PARALLEL SAFE;
ALTER FUNCTION citext(inet) PARALLEL SAFE;
ALTER FUNCTION citext_eq(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_ne(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_lt(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_le(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_gt(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_ge(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_cmp(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_hash(citext) PARALLEL SAFE;
ALTER FUNCTION citext_smaller(citext, citext) PARALLEL SAFE;
ALTER FUNCTION citext_larger(citext, citext) PARALLEL SAFE;
ALTER FUNCTION texticlike(citext, citext) PARALLEL SAFE;
ALTER FUNCTION texticnlike(citext, citext) PARALLEL SAFE;
ALTER FUNCTION texticregexeq(citext, citext) PARALLEL SAFE;
ALTER FUNCTION texticregexne(citext, citext) PARALLEL SAFE;
ALTER FUNCTION texticlike(citext, text) PARALLEL SAFE;
ALTER FUNCTION texticnlike(citext, text) PARALLEL SAFE;
ALTER FUNCTION texticregexeq(citext, text) PARALLEL SAFE;
ALTER FUNCTION texticregexne(citext, text) PARALLEL SAFE;
ALTER FUNCTION regexp_matches(citext, citext) PARALLEL SAFE;
ALTER FUNCTION regexp_matches(citext, citext, text) PARALLEL SAFE;
ALTER FUNCTION regexp_replace(citext, citext, text) PARALLEL SAFE;
ALTER FUNCTION regexp_replace(citext, citext, text, text) PARALLEL SAFE;
ALTER FUNCTION regexp_split_to_array(citext, citext) PARALLEL SAFE;
ALTER FUNCTION regexp_split_to_array(citext, citext, text) PARALLEL SAFE;
ALTER FUNCTION regexp_split_to_table(citext, citext) PARALLEL SAFE;
ALTER FUNCTION regexp_split_to_table(citext, citext, text) PARALLEL SAFE;
ALTER FUNCTION strpos(citext, citext) PARALLEL SAFE;
ALTER FUNCTION replace(citext, citext, citext) PARALLEL SAFE;
ALTER FUNCTION split_part(citext, citext, int) PARALLEL SAFE;
ALTER FUNCTION translate(citext, citext, text) PARALLEL SAFE;

UPDATE pg_proc SET proparallel = 's'
WHERE oid = 'min(citext)'::pg_catalog.regprocedure;

UPDATE pg_proc SET proparallel = 's'
WHERE oid = 'max(citext)'::pg_catalog.regprocedure;

UPDATE pg_aggregate SET aggcombinefn = 'citext_smaller'
WHERE aggfnoid = 'max(citext)'::pg_catalog.regprocedure;

UPDATE pg_aggregate SET aggcombinefn = 'citext_larger'
WHERE aggfnoid = 'max(citext)'::pg_catalog.regprocedure;