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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