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https://issues.apache.org/jira/browse/FLINK-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219452#comment-14219452
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Stephan Ewen commented on FLINK-1263:
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Actually, the problem is different. Binary operations on custom partitions fail
to consider the partitionings as compatible.
> Manual Partition operations are considered to keep data types constant
> ----------------------------------------------------------------------
>
> Key: FLINK-1263
> URL: https://issues.apache.org/jira/browse/FLINK-1263
> Project: Flink
> Issue Type: Bug
> Components: Java API, Optimizer, Scala API
> Affects Versions: 0.8-incubating
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 0.8-incubating
>
>
> This leads to a big loss in optimization potential and fully voids some cases.
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