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From "Ufuk Celebi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-984) Distinct operator for POJO DataSets without KeySelector and on UnsortedGrouping
Date Mon, 30 Jun 2014 10:20:24 GMT

    [ https://issues.apache.org/jira/browse/FLINK-984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047519#comment-14047519
] 

Ufuk Celebi commented on FLINK-984:
-----------------------------------

[~mholzemer] I meant KEY btw.

I see your points. I think my main motivation was the "blowup" and that users might be used
to specifying key fields and key selectors in groupBys.

> Distinct operator for POJO DataSets without KeySelector and on UnsortedGrouping
> -------------------------------------------------------------------------------
>
>                 Key: FLINK-984
>                 URL: https://issues.apache.org/jira/browse/FLINK-984
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Ufuk Celebi
>            Priority: Minor
>
> Two issues regarding the distinct operator:
> - The distinct operator does not support {{distinct()}} with POJO datasets. I think it
should be possible to implement a reflection based KeySelector which selects all public fields
as key?
> - All other grouped operators work by {{groupBy(GROUPING).operator(...)}} whereas the
distinct operator does {{distinct(GROUPING)}}. I think it would be more consistent to allow
{{groupBy(GROUPING).distinct()}}.



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