[jira] [Commented] (FLINK-2237) Add hash-based Aggregation

["Greg Hogan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392458#comment-15392458 ] 

Greg Hogan commented on FLINK-2237:
-----------------------------------

Is it intended for the user to specify both a {{CombineHint}} and {{ReduceHint}} once a hash-based reduce is implemented for FLINK-3480? So the user would make a call like

{code}
output = input
	.groupBy(0)
	.reduce(new MyReduce())
		.setCombineHint(CombineHint.HASH)
		.setReduceHint(ReduceHint.HASH);
{code}

> 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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