[SPARK-26416] Refactor `ColumnPruning` from `Optimizer.scala` to `ColumnPruning.scala`

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 2.4.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: DB Tsai
• Reporter: DB Tsai
• Created: 19/Dec/18 23:40
• Updated: 21/Dec/18 19:01
• Resolved: 21/Dec/18 19:01

Description

As `Optimizer.scala` becomes bigger and bigger, it's hard to add new rules and maintain them. We are refactoring out `ColumnPruning` from `Optimizer.scala` to `ColumnPruning.scala` so it's easier to add new logics in `ColumnPruning`.

Issue Links

• links to: GitHub Pull Request #23359