dbaliafroozeh opened a new pull request #28540:
URL: https://github.com/apache/spark/pull/28540
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### What changes were proposed in this pull request?
This PR extracts the logic for selecting the planned join type out of the
`JoinSelection` rule and moves it to `JoinSelectionHelper` in Catalyst.
### Why are the changes needed?
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.
### Does this PR introduce _any_ user-facing change?
`BuildSide`, `BuildLeft`, and `BuildRight` are moved from
`org.apache.spark.sql.execution` to Catalyst in
`org.apache.spark.sql.catalyst.optimizer`.
### How was this patch tested?
This is a refactoring, passes existing tests.
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