arina-ielchiieva commented on issue #1836: DRILL-7156: empty parquet files support URL: https://github.com/apache/drill/pull/1836#issuecomment-520813625 Good questions, you can investigate how now union types are handled. Regarding who wins, maybe you can look into `org.apache.drill.exec.physical.impl.union.UnionAllRecordBatch` to see how it Cretes combined schema using precedence rules.
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