Takuya Ueshin created SPARK-27314:
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Summary: Deduplicate exprIds for Union.
Key: SPARK-27314
URL: https://issues.apache.org/jira/browse/SPARK-27314
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Takuya Ueshin
We have been having a potential problem with {{Union}} when the children have
the same expression id in their outputs, which happens when self-union.
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