[jira] [Commented] (BEAM-586) CombineFns with no inputs should produce no outputs when used as a main input

["Pei He (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15546500#comment-15546500 ] 

Pei He commented on BEAM-586:
-----------------------------

Is that fair to say triggering defines whether and when CombineFns output, and CombineFns define what to output given a collection of inputs (could be empty)?

If this is what we want to do (I am not sure if it is right), possible options are:
1. triggering doesn't output empty pane.
or 2. CombineFns output nothing for an empty input collection.

I would prefer not to differentiate main input and side input.

> CombineFns with no inputs should produce no outputs when used as a main input
> -----------------------------------------------------------------------------
>
>                 Key: BEAM-586
>                 URL: https://issues.apache.org/jira/browse/BEAM-586
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Thomas Groh
>
> TestGloballyEmptyCollection seems to be violating this assumption
> https://github.com/apache/incubator-beam/pull/862/files#diff-a305819710e8d79d2b045d6416184f21R65 



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