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-415459642 @pnowojski Hi, thanks for your review. Yes, support VARCHAR(N) can solve the problem. As a workaround, we can cast the literals to varchar to solve the problem, like: `case 1 when 1 then cast('a' as varchar) when 2 then cast('bcd' as varchar) end`. The behavior in strict SQL standard mode(SQL:2003) returns a CHAR(N) type with blank-padded. However, I test Oracle/SqlServer/Mysql and they all return the value without blank-padded. Also, it seems that there is no way to turn blank-padded on. This change will break implementations in Flink. Do you think we should make it configurable? Thanks, Hequn
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