XiDuo You created SPARK-39475:
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Summary: Pull out complex join keys
Key: SPARK-39475
URL: https://issues.apache.org/jira/browse/SPARK-39475
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.4.0
Reporter: XiDuo You
For a sort merge join, a complex join key may run three times at most:
# exchange
# sort
# join
We can pull out it to project so we will execute it only once.
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