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Posted to issues@flink.apache.org by "Shakirullah (JIRA)" <ji...@apache.org> on 2015/06/17 21:09:02 UTC

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

    [ https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590360#comment-14590360 ] 

Shakirullah commented on FLINK-2237:
------------------------------------

We are TU-Berlin, IMPRO-3 course students and we are assigned to add hash-based aggregations to flink. We need some guidelines for how to implement it according to flink libraries(Operators,Functions,Runtime,Core,Memory Management, Java API etc) . Currently we are trying to use the two pass hash-based aggregation explained in book `DATABASE SYSTEMS The Complete Book Second Edition` by  `Hector Garcia-Molina, Jeffrey D. Ullman, Jennifer Widom` in section `15.5 Two-Pass Algorithms Based on Hashing`  

> 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
>            Priority: Minor
>              Labels: github-import
>             Fix For: pre-apache
>
>
> 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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