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https://issues.apache.org/jira/browse/BEAM-10169?focusedWorklogId=462277&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-462277
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ASF GitHub Bot logged work on BEAM-10169:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Jul/20 22:02
Start Date: 22/Jul/20 22:02
Worklog Time Spent: 10m
Work Description: lostluck opened a new pull request #12343:
URL: https://github.com/apache/beam/pull/12343
The test ends up being brittle if the package is vendored, so removing most
of the package path from the check validates the important parts, but allows
the vendoring paths to succeed.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 462277)
Time Spent: 7.5h (was: 7h 20m)
> ParDo* functions should declare the correct output N in their error message
> ---------------------------------------------------------------------------
>
> Key: BEAM-10169
> URL: https://issues.apache.org/jira/browse/BEAM-10169
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Aaron Tillekeratne
> Priority: P3
> Labels: noob, starter
> Fix For: Not applicable
>
> Time Spent: 7.5h
> Remaining Estimate: 0h
>
> User report noted the confusion in the error if you use a DoFn with 0 outputs
> with beam.ParDo instead of beam.ParDo0.
> In that case, a panic stack trace is followed by the cryptic: "expected 1
> output. Found: []"
> We can do better.
> While we can't change the return signature dynamically (that's for ParDoN
> only), we can instead clearly indicate:
> * the DoFn in question.
> * the number of outputs the DoFn has
> * and recommend using ParDo0, ParDo, ParDo2,...ParDo7, or ParDoN, as
> appropriate.
> https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/pardo.go#L361
> would need to change as well as any of the specific cases that follow.
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