This file is indexed.

/usr/share/postgres-xc/extension/pg_freespacemap--unpackaged--1.0.sql is in postgres-xc-contrib 1.1-2ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/pg_freespacemap/pg_freespacemap--unpackaged--1.0.sql */

-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pg_freespacemap" to load this file. \quit

ALTER EXTENSION pg_freespacemap ADD function pg_freespace(regclass,bigint);
ALTER EXTENSION pg_freespacemap ADD function pg_freespace(regclass);