/usr/share/postgresql/9.5/extension/hstore_plpython2u--1.0.sql is in postgresql-plpython-9.5 9.5.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | -- make sure the prerequisite libraries are loaded
LOAD 'plpython2';
SELECT NULL::hstore;
CREATE FUNCTION hstore_to_plpython2(val internal) RETURNS internal
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME', 'hstore_to_plpython';
CREATE FUNCTION plpython2_to_hstore(val internal) RETURNS hstore
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME', 'plpython_to_hstore';
CREATE TRANSFORM FOR hstore LANGUAGE plpython2u (
FROM SQL WITH FUNCTION hstore_to_plpython2(internal),
TO SQL WITH FUNCTION plpython2_to_hstore(internal)
);
COMMENT ON TRANSFORM FOR hstore LANGUAGE plpython2u IS 'transform between hstore and Python dict';
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