[SPARK-17268] Break Optimizer.scala apart

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1.0
• Component/s: SQL
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 27/Aug/16 00:54
• Updated: 16/Nov/16 19:49
• Resolved: 16/Nov/16 19:49

Description

Optimizer.scala has become too large to maintain. We would need to break it apart into multiple files each of which contains rules that are logically relevant.

We can create the following files for logical grouping:

• finish analysis
• joins
• expressions
• subquery
• objects

Sub-Tasks

• Move finish analysis stage into its own file: Resolved
• Move object optimization rules into its own file: Resolved
• Move subquery optimizer rules into its own file: Resolved
• Move expression optimizer rules into a separate file: Resolved
• Move join optimizer rules into a separate file: Resolved