pnowojski 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-415443589 At least according to draft of 2008 SQL Standard, this PR violates it (paragraph 9.3, section 3) iii) 3) says that the result type in this case should be `CHAR(N)` where N is the maximum of the inputs. If any of the inputs is `VARCHAR(x)`, the result should be also `VARCHAR`.
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