Pengcheng Xiong created HIVE-11409:
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Summary: CBO: Calcite Operator To Hive Operator (Calcite Return
Path): add SEL before UNION
Key: HIVE-11409
URL: https://issues.apache.org/jira/browse/HIVE-11409
Project: Hive
Issue Type: Sub-task
Reporter: Pengcheng Xiong
Assignee: Pengcheng Xiong
Two purpose: (1) to ensure that the data type of non-primary branch (the 1st
branch is the primary branch) of union can be casted to that of the primary
branch; (2) to make UnionProcessor optimizer work; (3) if the SEL is redundant,
it will be removed by IdentidyProjectRemover optimizer.
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