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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 Thu, 23 Aug 2018 15:28:32 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-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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