manannan2017 opened a new issue #2258: when using <=> operator，i meet some problems URL: https://github.com/apache/incubator-doris/issues/2258 1、sql： select cast('2019-09-09' as int) <=> NULL, cast('2019' as int) <=> NULL; ERROR 1064 (HY000): Unexpected exception: null excepted equal： select NULL <=> NULL, 2019 <=> NULL; 2、select 'a' <=> NULL, '2019-09-09' <=> NULL, 'true' <=> NULL, 78.367 <=> NULL; ERROR 5012 (HY000): 'a' is not a number excepted res: 0 0 0 0 3、table describe：  k6 is char  #2136
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