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https://issues.apache.org/jira/browse/BEAM-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546027#comment-17546027
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Danny McCormick commented on BEAM-656:
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This issue has been migrated to https://github.com/apache/beam/issues/17928
> Add support for side inputs/outputs to Java 8 lambdas in MapElements
> --------------------------------------------------------------------
>
> Key: BEAM-656
> URL: https://issues.apache.org/jira/browse/BEAM-656
> Project: Beam
> Issue Type: Improvement
> Components: sdk-ideas
> Reporter: Jani Patokallio
> Priority: P3
>
> Currently there's no way to use side inputs or outputs within Java 8 lambdas
> and MapElements. It would be nice if you could do something like this:
> {code:java}
> PCollection<Integer> wordLengths = words.apply(
> MapElements.via((String word) -> {
> int sideInput1= [[[ GetSideInputHere(); ]]]
> [[[ SetSideOutputHere ]]] (sideInput1+word.length());
> return word.length();
> }).withOutputType(new TypeDescriptor<Integer>() {});
> {code}
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