[FLINK-970] Implement a first(n) operator

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Assignee: Chesnay Schepler
• Reporter: Timo Walther
• Created: 24/Jun/14 08:35
• Updated: 24/Sep/14 16:25
• Resolved: 24/Sep/14 16:25

Description

It is only syntactic sugar, but I had many cases where I just needed the first element or the first 2 elements in a GroupReduce.

E.g. Instead of

.reduceGroup(new GroupReduceFunction<String, String>() {
					@Override
					public void reduce(Iterator<String> values, Collector<String> out) throws Exception {
						out.collect(values.next());
					}
				})

.first()