[SPARK-19314] Do not allow sort before aggregation in Structured Streaming plan

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.0.2, 2.1.0
• Fix Version/s: 2.0.3, 2.1.1, 2.2.0
• Component/s: Structured Streaming
• Target Version/s: 2.1.1
• Assignee: Tathagata Das
• Reporter: Tathagata Das
• Created: 20/Jan/17 22:26
• Updated: 24/Jan/17 09:27
• Resolved: 21/Jan/17 01:04

Description

Sort in a streaming plan should be allowed only after a aggregation in complete mode. Currently it is incorrectly allowed when present anywhere in the plan. It gives unpredictable potentially incorrect results.

Issue Links

• links to: [Github] Pull Request #16662 (tdas)