/usr/share/postgresql/9.6/extension/citus--6.0-15--6.0-16.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 | /* citus--6.0-15--6.0-16.sql */
SET search_path = 'pg_catalog';
CREATE FUNCTION mark_tables_colocated(source_table_name regclass, target_table_names regclass[])
RETURNS void
LANGUAGE C STRICT
AS 'MODULE_PATHNAME', $$mark_tables_colocated$$;
COMMENT ON FUNCTION mark_tables_colocated(source_table_name regclass, target_table_names regclass[])
IS 'mark target distributed tables as colocated with the source table';
RESET search_path;
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