[SPARK-10988] Reduce duplication in Aggregate2's expression rewriting logic

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.6.0
• Component/s: SQL
• Target Version/s: 1.6.0
• Assignee: Josh Rosen
• Reporter: Josh Rosen
• Created: 07/Oct/15 23:41
• Updated: 09/Oct/15 21:15
• Resolved: 08/Oct/15 21:57

Description

In `aggregate/utils.scala`, there is a substantial amount of duplication in the expression-rewriting logic. As a prerequisite to supporting imperative aggregate functions in `TungstenAggregate`, we should refactor this file so that the same expression-rewriting logic is used for both `SortAggregate` and `TungstenAggregate`.

Issue Links

• links to: [Github] Pull Request #9015 (JoshRosen)