/usr/share/postgresql/10/extension/citus--6.1-14--6.1-15.sql is in postgresql-10-citus 7.0.3.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 | /* citus--6.1-14--6.1-15.sql */
SET search_path = 'pg_catalog';
CREATE FUNCTION master_dist_local_group_cache_invalidate()
RETURNS trigger
LANGUAGE C
AS 'MODULE_PATHNAME', $$master_dist_local_group_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_local_group_cache_invalidate()
IS 'register node cache invalidation for changed rows';
CREATE TRIGGER dist_local_group_cache_invalidate
AFTER UPDATE
ON pg_catalog.pg_dist_local_group
FOR EACH ROW EXECUTE PROCEDURE master_dist_local_group_cache_invalidate();
RESET search_path;
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