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