paul-rogers commented on issue #1945: DRILL-7502: Invalid codegen for typeof() with UNION URL: https://github.com/apache/drill/pull/1945#issuecomment-570328592 Am now seeing failures in the `GUnionFunctions` where a parameter is declared as `UnionHolder` but is now being created as `FieldReader`. Seems that the bug that I fixed may have been introduced to make these functions work, but had the side effect of forcing union parameters to be a `UnionReader` even if declared as a `FieldReader`. Looks like my change now does the opposite. So, more work to be done to make the decision based on the kind of field.
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