Vaclav Plajt created BEAM-5306:
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Summary: Joins should support more than one output from user
joining UDF
Key: BEAM-5306
URL: https://issues.apache.org/jira/browse/BEAM-5306
Project: Beam
Issue Type: Sub-task
Components: dsl-euphoria
Reporter: Vaclav Plajt
Assignee: Vaclav Plajt
Output elements from joining user-defined functions are collected using
`SingleValueCollector`, so only one output value is supported. That is wrong
limitation. Refactor 'DoFnCollector' to be universally usable to collect many
elements with custom adaptation.
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