Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/4102
I think the root cause is that TUMBLE_START inherits the wrong type
(`TimeIndicatorRelDataType`) from rowtime column. So maybe a better solution
is to re-create a `RelDataType` from `optimizedPlan`'s rowType and
`orignalPlan`'s rowType and pass into the `getConversionMapper` method. I
create a simple commit for this:
https://github.com/wuchong/flink/commit/82c17ab45699f5f9beb925b156e760ebdeff79fb
What do you think? @sunjincheng121 @fhueske
BTW, do we really need so many IT cases for this ?
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