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Subject [GitHub] hequn8128 commented on issue #6519: [FLINK-9559] [table] The type of a union of CHAR columns of different lengths should be VARCHAR
Date Wed, 29 Aug 2018 15:43:44 GMT
hequn8128 commented on issue #6519: [FLINK-9559] [table] The type of a union of CHAR columns
of different lengths should be VARCHAR
URL: https://github.com/apache/flink/pull/6519#issuecomment-417001158
 
 
   Hi, @pnowojski I agree with you now: change all CHAR to VARCHAR in Flink.
   
   And yes, this is a serious problem since `case when`, `concat`, etc are very commonly used
in SQL. Considering that changing CHAR to VARCHAR brakes backward compatibility, I think we
can provide a configuration that whether to change char to varchar for users.
   
   Since this is a big change. It would be great to have your opinions here. @fhueske @twalthr

   

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