[jira] [Created] (SPARK-27911) PySpark Packages should automatically choose correct scala version

["Michael Armbrust (JIRA)" <ji...@apache.org>]

Michael Armbrust created SPARK-27911:
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             Summary: PySpark Packages should automatically choose correct scala version
                 Key: SPARK-27911
                 URL: https://issues.apache.org/jira/browse/SPARK-27911
             Project: Spark
          Issue Type: New Feature
          Components: PySpark
    Affects Versions: 2.4.3
            Reporter: Michael Armbrust


Today, users of pyspark (and Scala) need to manually specify the version of Scala that their Spark installation is using when adding a Spark package to their application. This extra configuration confusing to users who may not even know which version of Scala they are using (for example, if they installed Spark using {{pip}}). The confusion here is exacerbated by releases in Spark that have changed the default from {{2.11}} -> {{2.12}} -> {{2.11}}.

https://spark.apache.org/releases/spark-release-2-4-2.html
https://spark.apache.org/releases/spark-release-2-4-3.html

Since Spark can know which version of Scala it was compiled for, we should give users the option to automatically choose the correct version.  This could be as simple as a substitution for {{$scalaVersion}} or something when resolving a package (similar to SBTs support for automatically handling scala dependencies).

Here are some concrete examples of users getting it wrong and getting confused:
https://github.com/delta-io/delta/issues/6
https://github.com/delta-io/delta/issues/63



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