BEGIN;
ALTER TABLE xml_path_index  ADD COLUMN nodedatavector TSVECTOR;
UPDATE xml_path_index SET  nodedatavector = to_tsvector(nodedata);
tsvector_update_trigger(nodedatavector, 'pg_catalog.english', nodedata);
CREATE INDEX xml_path_index_vector ON xml_path_index USING gin(nodedatavector);
COMMIT;