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-612776540 > I have tried use EnumUtils.convert to take a cast for Union's child expression. CompileException was thrown during compiling generated code. It seems EnumUtils.convert can not handle with Enumerator. `EnumUtils.convert` is the unified entrance for type cast/convert. When something causes compileException, we'd better fix it.
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