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https://issues.apache.org/jira/browse/BEAM-184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545965#comment-17545965
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Danny McCormick commented on BEAM-184:
--------------------------------------
This isn't actually real, but this issue has been migrated to
https://github.com/apache/beam/issues/17872
> Using Merging Windows and/or Triggers without a downstream aggregation should
> fail
> ----------------------------------------------------------------------------------
>
> Key: BEAM-184
> URL: https://issues.apache.org/jira/browse/BEAM-184
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Ben Chambers
> Priority: P3
> Labels: Clarified, backward-incompatible
>
> Both merging windows (such as sessions) and triggering only actually happen
> at an aggregation (GroupByKey). We should produce errors in any of these
> cases:
> 1. Merging window used without a downstream GroupByKey
> 2. Triggers used without a downstream GroupByKey
> 3. Window inspected after inserting a merging window and before the GroupByKey
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