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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2019/04/22 00:46:00 UTC

[jira] [Created] (SPARK-27536) Code improvements for 3.0: existentials edition

Sean Owen created SPARK-27536:
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             Summary: Code improvements for 3.0: existentials edition
                 Key: SPARK-27536
                 URL: https://issues.apache.org/jira/browse/SPARK-27536
             Project: Spark
          Issue Type: Improvement
          Components: ML, Spark Core, SQL, Structured Streaming
    Affects Versions: 3.0.0
            Reporter: Sean Owen
            Assignee: Sean Owen


The Spark code base makes use of 'existential types' in Scala, a language feature which is quasi-deprecated -- it generates a warning unless scala.language.existentials is imported, and there is talk of removing it from future Scala versions: https://contributors.scala-lang.org/t/proposal-to-remove-existential-types-from-the-language/2785

We can get rid of most usages of this feature with lots of minor changes to the code. A PR is coming to demonstrate what's involved.



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