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https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140784#comment-15140784
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ASF GitHub Bot commented on FLINK-2237:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1517#discussion_r52458969
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/operators/base/ReduceOperatorBase.java
---
@@ -52,6 +52,30 @@
*/
public class ReduceOperatorBase<T, FT extends ReduceFunction<T>> extends
SingleInputOperator<T, T, FT> {
+ /**
+ * An enumeration of hints, optionally usable to tell the system
exactly how to execute the reduce.
+ */
+ public enum ReduceHint {
--- End diff --
Should be renamed to `CombineHint` and all corresponding methods and member
variables as well.
> Add hash-based Aggregation
> --------------------------
>
> Key: FLINK-2237
> URL: https://issues.apache.org/jira/browse/FLINK-2237
> Project: Flink
> Issue Type: New Feature
> Reporter: Rafiullah Momand
> Assignee: Gabor Gevay
> Priority: Minor
>
> Aggregation functions at the moment are implemented in a sort-based way.
> How can we implement hash based Aggregation for Flink?
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