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https://issues.apache.org/jira/browse/BEAM-659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072533#comment-16072533
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Jean-Baptiste Onofré commented on BEAM-659:
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[~kenn] I guess this Jira can be fixed, right ?
> WindowFn#isCompatible should provide a meaningful reason
> --------------------------------------------------------
>
> Key: BEAM-659
> URL: https://issues.apache.org/jira/browse/BEAM-659
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Huafeng Wang
> Priority: Minor
> Labels: easy, easyfix, starter
> Fix For: 2.1.0
>
>
> {{WindowFn#isCompatible(...)}} returns a true/false answer without any
> explanation of why; it suffers from a form of [boolean
> blindness|https://existentialtype.wordpress.com/2011/03/15/boolean-blindness/].
> We alleviated this for {{Coder#isDeterministic()}} by switching to
> {{Coder#verifyDeterministic()}} which can raise an exception describing why
> it is not deterministic (it could just as easily have been a return value).
> We should do the same for {{WindowFn#isCompatible(...)}}.
> See here:
> http://stackoverflow.com/questions/39617897/inputs-to-flatten-had-incompatible-window-windowfns-when-cogroupbykey-with-calen
> (a decent {{toString}} would go a long way, for immediate and trivial
> improvement)
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