gatorsmile commented on issue #23359: [SPARK-26416] [SQL] Refactor `ColumnPruning` from `Optimizer.scala` to `ColumnPruning.scala` URL: https://github.com/apache/spark/pull/23359#issuecomment-449217014 Discussed it with @dongjoon-hyun offline. There are various bug fixes in the code history. The change history is very valuable for us [especially for new contributors] to understand the code. Previously, we did the split, but it makes us much harder to find out the original PRs who introduced the changes. For example, the following screenshot can clearly show all the PRs that changed this column pruning rule. The change history is very useful for reviewers and new learners. 
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