CREATE OR REPLACE FUNCTION message_store.category(
stream_name varchar
) RETURNS varchar AS $$ BEGIN
RETURN SPLIT_PART(category.stream_name, '-', 1);
END; $$ LANGUAGE plpgsql IMMUTABLE;
CREATE OR REPLACE FUNCTION message_store.category(
stream_name varchar
) RETURNS varchar AS $$ BEGIN
RETURN SPLIT_PART(category.stream_name, '-', 1);
END; $$ LANGUAGE plpgsql IMMUTABLE;