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https://issues.apache.org/jira/browse/BEAM-11107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219384#comment-17219384
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Boyuan Zhang commented on BEAM-11107:
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The problem is caused by
[sanitizeDanglingPTransformInputs|https://github.com/apache/beam/blob/master/runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/graph/GreedyPipelineFuser.java#L350-L424]
function, which drops the sideInput from transforms if the sideInput is not
specified in the ExecutableStage. It seems like when fusing transforms into
ExecutableStage, we didn't populate sideInput correctly.
> GreedFuserPipeline drops side input from PTransform.inputs() when fusion
> happens
> --------------------------------------------------------------------------------
>
> Key: BEAM-11107
> URL: https://issues.apache.org/jira/browse/BEAM-11107
> Project: Beam
> Issue Type: Bug
> Components: java-fn-execution
> Reporter: Boyuan Zhang
> Priority: P2
>
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