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https://issues.apache.org/jira/browse/FLINK-984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047490#comment-14047490
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Markus Holzemer commented on FLINK-984:
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I agree with the first point.
With the second point I am not sure. For me distinct is not a real group
operation like for example a reduce. The current syntax is not
distinct(GROUPING) but distinct(KEY) and I am not sure if it would confuse
people if they would need to specify a grouping to get distinct values that
consider only some fields.
Perhaps we can get some more opinions on that?
> 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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