1、问题现象createdatabasesyw_mtr;usesyw_mtr;CREATETABLEt1(f1VARCHAR(255)CHARACTERSETutf8)engine=tianmu;CREATETABLEt2ASSELECTLEFT(f1,171)ASf2FROMt1UNIONSELECTLEFT(f1,171)ASf2FROMt1;ERROR2013(HY000):LostconnectiontoMySQLserverduringquery问题issue：https://github.com/stoneatom/stonedb/issues/2262、问题原因bug代码行Que
