[jira] [Assigned] (BEAM-3746) Count.globally should override getIncompatibleGlobalWindowErrorMessage to tell the user the usage that is currently only in javadoc

["Scott Wegner (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Scott Wegner reassigned BEAM-3746:
----------------------------------

    Assignee: Kenneth Knowles

> Count.globally should override getIncompatibleGlobalWindowErrorMessage to tell the user the usage that is currently only in javadoc
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-3746
>                 URL: https://issues.apache.org/jira/browse/BEAM-3746
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>            Priority: Major
>              Labels: beginner, newbie, starter
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> https://beam.apache.org/documentation/sdks/javadoc/2.3.0/org/apache/beam/sdk/transforms/Count.html#globally--
> "Note: if the input collection uses a windowing strategy other than GlobalWindows, use Combine.globally(Count.<T>combineFn()).withoutDefaults() instead."
> But the actual crash a user gets is:
> "java.lang.IllegalStateException: Default values are not supported in Combine.globally() if the output PCollection is not windowed by GlobalWindows. Instead, use Combine.globally().withoutDefaults() to output an empty PCollection if the input PCollection is empty, or Combine.globally().asSingletonView() to get the default output of the CombineFn if the input PCollection is empty."
> There is a method that exists solely to make this actually useful, so we should use it!



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