/usr/share/postgresql/9.6/extension/citus--6.0-14--6.0-15.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 | /* citus--6.0-14--6.0-15.sql */
CREATE FUNCTION pg_catalog.master_dist_placement_cache_invalidate()
RETURNS trigger
LANGUAGE C
AS 'MODULE_PATHNAME', $$master_dist_placement_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_placement_cache_invalidate()
IS 'register relcache invalidation for changed placements';
CREATE TRIGGER dist_placement_cache_invalidate
AFTER INSERT OR UPDATE OR DELETE
ON pg_catalog.pg_dist_shard_placement
FOR EACH ROW EXECUTE PROCEDURE master_dist_placement_cache_invalidate();
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