dongjoon-hyun commented on issue #23359: [SPARK-26416] [SQL] Refactor `ColumnPruning` from `Optimizer.scala` to `ColumnPruning.scala` URL: https://github.com/apache/spark/pull/23359#issuecomment-449185869 ? It's only 100 line. Keeping each rule in a single file have more benefits. Historically, at 2.0.0, we did a lot of refactoring already. And, this is for 3.0. Technically, all history is in branch-2.4 and we can see it easily in GitHub.
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