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https://issues.apache.org/jira/browse/FLINK-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133984#comment-14133984
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Robert Metzger commented on FLINK-1062:
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Why are you thinking about annotating the types for the lambdas? Isn't passing
them as (var-)arguments after the lambda easier? (for the user, syntax-wise)
What are our chances of contributing to the OpenJDK 8 compiler to add the
information into the class files, similar to the Eclipse Compiler?
By the way, there was a link recently on Twitter regarding the end of the
official Java 7 support by Oracle, already in April 2015:
http://www.oracle.com/technetwork/java/eol-135779.html
> Type Extraction for Lambdas
> ---------------------------
>
> Key: FLINK-1062
> URL: https://issues.apache.org/jira/browse/FLINK-1062
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Affects Versions: 0.7-incubating
> Reporter: Stephan Ewen
> Assignee: Timo Walther
> Fix For: 0.7-incubating
>
>
> Lambdas currently work only for {{filter}} and {{reduce(a,b)}}, because
> Lambda type extraction is not in place right now.
> We need to extend the type extraction for lambdas to support the other
> functions.
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