[GitHub] [incubator-doris] manannan2017 opened a new issue #2258: when using <=> operator，i meet some problems

[GitBox]

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：
   
![image](https://user-images.githubusercontent.com/33174388/69305444-f1b74380-0c5e-11ea-96b9-6827cf59055f.png)
   
   k6 is char
   
![image](https://user-images.githubusercontent.com/33174388/69305476-190e1080-0c5f-11ea-9ffb-eeb4e47f89db.png)
   #2136 
   

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