L. C. Hsieh created SPARK-51474:
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Summary: Don't insert redundant ColumnarToRowExec for node
supporting both columnar and row output
Key: SPARK-51474
URL: https://issues.apache.org/jira/browse/SPARK-51474
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.0.0
Reporter: L. C. Hsieh
There is a corner case in ApplyColumnarRulesAndInsertTransitions. When a plan
required to output rows, if the node supports both columnar and row output, the
rule currently adds a redundant ColumnarToRowExec to its upstream. This
ColumnarToRowExec is redundant and unnecessary.
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