Edit C:\Program Files (x86)\PostgreSQL\9.5\share\extension\hstore--1.1--1.2.sql

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

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

-- A version of 1.1 was shipped with these objects mistakenly in 9.3.0.
-- Therefore we only add them if we detect that they aren't already there and
-- dependent on the extension.

DO LANGUAGE plpgsql

BEGIN

PERFORM 1
   FROM pg_proc p
       JOIN  pg_depend d
          ON p.proname = 'hstore_to_json_loose'
            AND d.classid = 'pg_proc'::regclass
            AND d.objid = p.oid
            AND d.refclassid = 'pg_extension'::regclass
       JOIN pg_extension x
          ON d.refobjid = x.oid
            AND  x.extname = 'hstore';

IF NOT FOUND
   THEN

CREATE FUNCTION hstore_to_json(hstore)
        RETURNS json
        AS 'MODULE_PATHNAME', 'hstore_to_json'
        LANGUAGE C IMMUTABLE STRICT;

CREATE CAST (hstore AS json)
          WITH FUNCTION hstore_to_json(hstore);

CREATE FUNCTION hstore_to_json_loose(hstore)
        RETURNS json
        AS 'MODULE_PATHNAME', 'hstore_to_json_loose'
        LANGUAGE C IMMUTABLE STRICT;

END IF;

END;

$$;

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