Ali Afroozeh created SPARK-31719:
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             Summary: Refactor JoinSelection
                 Key: SPARK-31719
                 URL: https://issues.apache.org/jira/browse/SPARK-31719
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Ali Afroozeh


This PR extracts the logic for selecting the planned join type out of the 
`JoinSelection` rule and moves it to `JoinSelectionHelper` in Catalyst. This 
change both cleans up the code in `JoinSelection` and allows the logic to be in 
one place and be used from other rules that need to make decision based on the 
join type before the planning time.



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