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https://issues.apache.org/jira/browse/BEAM-12438?focusedWorklogId=605474&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-605474
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ASF GitHub Bot logged work on BEAM-12438:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Jun/21 19:40
Start Date: 02/Jun/21 19:40
Worklog Time Spent: 10m
Work Description: lostluck commented on pull request #14924:
URL: https://github.com/apache/beam/pull/14924#issuecomment-853332847
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Issue Time Tracking
-------------------
Worklog Id: (was: 605474)
Time Spent: 50m (was: 40m)
> Sharing input to both a GBK and a CoGBK causes LP error w/schemas
> -----------------------------------------------------------------
>
> Key: BEAM-12438
> URL: https://issues.apache.org/jira/browse/BEAM-12438
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Robert Burke
> Priority: P2
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Constructing a pipeline with a PCol<KV> (call it A) used as an input to a
> GBK, using that output to generate an PCol<KV> (call it B) and using both A
> and B as inputs to a CoGBK causes the DoFn after the CoGBK to fail with an
> encoding error.
> Essentially the Length Prefix coder applied to A isn't applied to the output
> of the CoGBK for the expand, causing the pipeline to fail. Only happens with
> Row encoded structs.
> This is likely due to CoGBK being a synthetic construct on top of a GBK with
> a extra Inject and Expand operations, with the Inject missing the LP coding
> that the earlier GBK received.
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