[jira] [Created] (FLINK-2991) Extend Window Operators to Allow Efficient Fold Operation

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-2991:
---------------------------------------

             Summary: Extend Window Operators to Allow Efficient Fold Operation
                 Key: FLINK-2991
                 URL: https://issues.apache.org/jira/browse/FLINK-2991
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek


Right now, a window fold is implemented as a WindowFunction that gets all the elements as input. No pre-aggregation is performed. The window operator should be extended to also allow the fold to also be pre-aggregated.

This requires changing the signature of the {{WindowBuffer}} so that it can emit a type other than the input type.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)