[SPARK-22206] gapply in R can't work on empty grouping columns

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.1.3, 2.2.1, 2.3.0
• Component/s: SparkR, SQL
• Assignee: L. C. Hsieh
• Reporter: L. C. Hsieh
• Created: 05/Oct/17 05:13
• Updated: 12/Dec/22 18:10
• Resolved: 05/Oct/17 14:37

Description

gapply in R invokes FlatMapGroupsInRExec in runtime, but FlatMapGroupsInRExec.requiredChildDistribution didn't consider empty grouping attributes. So gapply can't work on empty grouping columns.

Issue Links

• links to: [Github] Pull Request #19436 (viirya)