postgresql – SELECT … INTO的EXECUTE未实现

CREATE OR REPLACE FUNCTION create_partition_and_insert()
RETURNS trigger AS
$BODY$
DECLARE
partition VARCHAR(25);
_date text;
BEGIN
EXECUTE 'SELECT REPLACE(' || quote_literal(NEW.date) || ',''-'',''_'') into _date';
partition := TG_RELNAME || '_' || _date || ‘p’;
IF NOT EXISTS(SELECT relname FROM pg_class WHERE relname=partition) THEN
RAISE NOTICE 'A partition has been created %',partition;
EXECUTE 'CREATE TABLE ' || partition || ' (check (date = ''' || NEW.date || ''')) INHERITS (' || TG_RELNAME || ');';
END IF;
EXECUTE 'INSERT INTO ' || partition || ' SELECT(' || TG_RELNAME || ' ' || quote_literal(NEW) || ').*;';
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql;

但是在运行时我得到这个错误：

06001

我不知道为什么会发生这种情况,在线提供的解决方案都没有在这里帮助我.