[SPARK-9577] Surface concrete iterator types in various sort classes

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.0
• Component/s: SQL
• Target Version/s: 1.5.0
• Sprint: Spark 1.5 release
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 03/Aug/15 23:18
• Updated: 04/Aug/15 01:48
• Resolved: 04/Aug/15 01:48

Description

We often return abstract iterator types in various sort-related classes (e.g. UnsafeKVExternalSorter).

It is actually better to return a more concrete type, so the callsite uses that type and JIT can inline the iterator calls.

Issue Links

• links to: [Github] Pull Request #7911 (rxin)