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https://issues.apache.org/jira/browse/BEAM-10297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548741#comment-17548741
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Danny McCormick commented on BEAM-10297:
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This issue has been migrated to https://github.com/apache/beam/issues/20356
> Group.<Row>globally().aggregate(Count.combineFn())) Throws Error
> ----------------------------------------------------------------
>
> Key: BEAM-10297
> URL: https://issues.apache.org/jira/browse/BEAM-10297
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.19.0
> Reporter: Drew Hodun
> Priority: P3
> Labels: Clarified
>
> Trying to Count the number of rows in a window with Group and Combiner (as
> opposed to GroupBy "*" or a any field), but get an error:
> .apply("WindowByMinute",
> Window.into(FixedWindows.of(Duration.standardSeconds(60))))
> .apply("CountPerMinute",
> Group.<Row>globally().aggregate(Count.combineFn()))
> threw:
> ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java
> (default-cli) on project advanced-dataflow-lab: An exception occured while
> executing the Java class. If the input collection uses a windowing strategy
> other than GlobalWindows, use
> Combine.globally(Count.<T>combineFn()).withoutDefaults() instead. ->
> Reuven Lax has indicated this is likely a bug.
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