[SPARK-13306] Initial implementation for uncorrelated scalar subquery

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: SQL
• Assignee: Davies Liu
• Reporter: Davies Liu
• Created: 12/Feb/16 22:33
• Updated: 23/Feb/16 21:13
• Resolved: 21/Feb/16 05:02

Description

A scalar subquery is a subquery that only generate single row and single column, could be used as part of expression.

Uncorrelated scalar subquery means it does not has a reference to external table.

Issue Links

• links to: [Github] Pull Request #11190 (davies)
• links to: [Github] Pull Request #11285 (rxin)
• links to: [Github] Pull Request #11329 (hvanhovell)