兼容q'转义字符语法
vastbase=# select q'asdffwwda';
?column?
----------
sdffwwd
(1 row)
vastbase=# select q'{sdfewww wwfew}';
?column?
----------------
sdfewww wwfew
(1 row)
vastbase=# select q'[It's a bird ]' from dual;
?column?
--------------
It's a bird
(1 row)
