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https://issues.apache.org/jira/browse/FLINK-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14204788#comment-14204788
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ASF GitHub Bot commented on FLINK-1227:
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Github user twalthr commented on the pull request:
https://github.com/apache/incubator-flink/pull/192#issuecomment-62386486
Why is this change necessary? `getUnaryOperatorReturnType()` already checks
for ResultTypeQueryable...
> KeySelector can't implement ResultTypeQueryable
> -----------------------------------------------
>
> Key: FLINK-1227
> URL: https://issues.apache.org/jira/browse/FLINK-1227
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Affects Versions: 0.7.0-incubating
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Trivial
>
> The TypeExtractor currently doesn't check whether a KeySelector implements
> the ResultTypeQueryable interface.
> Since i expected it to work i guess you can call ti a clarity issue.
> Additionally, this change will allow me to use KeySelector for the Python API.
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