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-411444753 @twalthr Thanks a lot for your review. You are right. This change will break implementations and we should be careful. From my point of view, we don't need to make it configurable. Mysql return varchar directly, [see](https://dev.mysql.com/doc/refman/8.0/en/control-flow-functions.html), "If all types are character string (CHAR or VARCHAR), the result is VARCHAR with maximum length determined by the longest character length of the operands.". Of course, it is ok to make it configurable if you both think yes.
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