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From "Neelesh Srinivas Salian (JIRA)" <>
Subject [jira] [Assigned] (BEAM-659) WindowFn#isCompatible should provide a meaningful reason
Date Wed, 19 Oct 2016 03:08:58 GMT


Neelesh Srinivas Salian reassigned BEAM-659:

    Assignee: Neelesh Srinivas Salian

> WindowFn#isCompatible should provide a meaningful reason
> --------------------------------------------------------
>                 Key: BEAM-659
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Neelesh Srinivas Salian
>            Priority: Minor
>              Labels: easy, easyfix, starter
> {{WindowFn#isCompatible(...)}} returns a true/false answer without any explanation of
why; it suffers from a form of [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:
> (a decent {{toString}} would go a long way, for immediate and trivial improvement)

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