/usr/share/postgresql/10/extension/ltree_plpython2u--1.0.sql is in postgresql-plpython-10 10.3-1.
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 | /* contrib/ltree_plpython/ltree_plpython2u--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION ltree_plpython2u" to load this file. \quit
CREATE FUNCTION ltree_to_plpython2(val internal) RETURNS internal
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME', 'ltree_to_plpython';
CREATE TRANSFORM FOR ltree LANGUAGE plpython2u (
FROM SQL WITH FUNCTION ltree_to_plpython2(internal)
);
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