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https://issues.apache.org/jira/browse/FLINK-2633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14734863#comment-14734863
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ASF GitHub Bot commented on FLINK-2633:
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Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1104#issuecomment-138573293
Is it really necessary to discuss an obvious bug on the mailing list? The
`EitherTypeInfo` suffers from the same problem and, thus, it seams to be a
systematic error. In order to prevent future mistakes like this, I don't see a
different way than making the developer aware that he has to implement these
methods.
> OptionTypeInfo does not have proper equals and hashCode method
> --------------------------------------------------------------
>
> Key: FLINK-2633
> URL: https://issues.apache.org/jira/browse/FLINK-2633
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The {{OptionTypeInfo}} does not have a proper {{equals}} and {{hashCode}}
> definition. As a consequence, types which contain an option type won't be
> detected to be equal even though the element type of the option is identical.
> This can cause problems when you try to union two data sets of type
> {{DataSet[Option[Int]]}}, for example.
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