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https://issues.apache.org/jira/browse/BEAM-661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía resolved BEAM-661.
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Resolution: Fixed
> CalendarWindows#isCompatibleWith should use equals instead of ==
> ----------------------------------------------------------------
>
> Key: BEAM-661
> URL: https://issues.apache.org/jira/browse/BEAM-661
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Ben Chambers
> Priority: Minor
> Fix For: Not applicable
>
>
> http://stackoverflow.com/questions/39617897/inputs-to-flatten-had-incompatible-window-windowfns-when-cogroupbykey-with-calen
> We're using `==` instead of `.equals` to compare objects, which causes
> equivalent CalendarWindows to be incompatible.
> https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/windowing/CalendarWindows.java#L143
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