Eugene Kirpichov created BEAM-1979:
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Summary: Outputting to an undeclared side output TupleTag should
throw
Key: BEAM-1979
URL: https://issues.apache.org/jira/browse/BEAM-1979
Project: Beam
Issue Type: Bug
Components: runner-dataflow
Reporter: Eugene Kirpichov
Assignee: Eugene Kirpichov
Currently some runners (perhaps all of them?..), when you output to a side
output tag that wasn't passed to ParDo.withOutputTags, simply drop the data on
the floor (or increase some aggregators).
Silent data dropping is never okay, and it's never okay to output to an
undeclared tag. So instead this should throw.
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