This file is indexed.

/usr/share/postgres-xc/extension/file_fdw--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/file_fdw/file_fdw--1.0.sql */

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

CREATE FUNCTION file_fdw_handler()
RETURNS fdw_handler
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

CREATE FUNCTION file_fdw_validator(text[], oid)
RETURNS void
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

CREATE FOREIGN DATA WRAPPER file_fdw
  HANDLER file_fdw_handler
  VALIDATOR file_fdw_validator;