Pengcheng Xiong created HIVE-10375:
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Summary: CBO (Calcite Return Path): disable the identity project
remover for some union operators
Key: HIVE-10375
URL: https://issues.apache.org/jira/browse/HIVE-10375
Project: Hive
Issue Type: Sub-task
Reporter: Pengcheng Xiong
The identity project remover will remove the "Project" operator that is
required by some Union Operators. A temporary solution is to disable it for
them.
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