[FLINK-1020] Add minBy() and maxBy() selection functions

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.6-incubating
• Fix Version/s: 0.7.0-incubating
• Labels: starter
• Assignee: Tobias
• Reporter: Stephan Ewen
• Created: 10/Jul/14 10:31
• Updated: 28/Feb/19 14:29
• Resolved: 02/Sep/14 13:01

Description

Adding a minBy() and maxBy() function is a valuable addition. Those are not aggregation functions, because they do not work on individual fields.

They can be implemented as a simple reduce.