DonnyZone commented on issue #1881: [CALCITE-3216] ClassCastException when running aggregate function and window function over Union URL: https://github.com/apache/calcite/pull/1881#issuecomment-607136784 Could you make a conclusion on the topics below? 1) Legal type pairs that is assignable in validation but illegal in runtime. 2) Apart from Union, other SetOp (e.g., Intersect) has the same problem? 3) According to the context and discussion in [CALCITE-3565](https://issues.apache.org/jira/browse/CALCITE-3565) and [CALCITE-3414](https://issues.apache.org/jira/browse/CALCITE-3414), can we use `EnumUtils.convert`?
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