Eric5553 opened a new pull request #27595: [SPARK-30842][SQL] Adjust abstraction structure for join operators URL: https://github.com/apache/spark/pull/27595 ### What changes were proposed in this pull request? Currently the join operators are not well abstracted, since there are lot of common logic. A trait can be created for easier pattern matching and other future handiness. This is a follow-up PR based on comment https://github.com/apache/spark/pull/27509#discussion_r379613391 . This PR refined from the following aspects: 1. Refined structure of all physical join operators 2. Add missing joinType field for CartesianProductExec operator 3. Refined codes related to Explain Formatted ### Why are the changes needed? Make the code consistent with other operators and for future handiness of join operators. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing tests
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