Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19727
CTE reuse can cause the performance regression. It is hard to address
without considering the costs.
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Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19727
Simply reusing `ProjectExec` doesn't really reduce the scan. The
duplication execution of CTE is a well known issue. I've addressed it before.
But seems no solution to deal all possible cases yet.
Github user AmplabJenkins commented on the issue:
https://github.com/apache/spark/pull/19727
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Github user SparkQA commented on the issue:
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