/usr/share/postgresql/9.6/extension/citus--5.1-6--5.1-7.sql is in postgresql-9.6-citus 6.0.1.PGDG-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 | DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_foreign_file(text, text, bigint, text[], integer[]);
CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
RETURNS void
LANGUAGE C STRICT
AS 'MODULE_PATHNAME', $$worker_fetch_foreign_file$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
IS 'fetch foreign file from remote node and apply file';
DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_regular_table(text, text, bigint, text[], integer[]);
CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
RETURNS void
LANGUAGE C STRICT
AS 'MODULE_PATHNAME', $$worker_fetch_regular_table$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
IS 'fetch PostgreSQL table from remote node';
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