[jira] [Assigned] (SPARK-18891) Support for specific collection types

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-18891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-18891:
-----------------------------------

    Assignee: Michal Šenkýř

> Support for specific collection types
> -------------------------------------
>
>                 Key: SPARK-18891
>                 URL: https://issues.apache.org/jira/browse/SPARK-18891
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.3, 2.1.0
>            Reporter: Michael Armbrust
>            Assignee: Michal Šenkýř
>            Priority: Critical
>
> Encoders treat all collections the same (i.e. {{Seq}} vs {{List}}) which force users to only define classes with the most generic type.
> An [example error|https://databricks-prod-cloudfront.cloud.databricks.com/public/4027ec902e239c93eaaa8714f173bcfc/1023043053387187/2398463439880241/2840265927289860/latest.html]:
> {code}
> case class SpecificCollection(aList: List[Int])
> Seq(SpecificCollection(1 :: Nil)).toDS().collect()
> {code}
> {code}
> java.lang.RuntimeException: Error while decoding: java.util.concurrent.ExecutionException: java.lang.Exception: failed to compile: org.codehaus.commons.compiler.CompileException: File 'generated.java', Line 98, Column 120: No applicable constructor/method found for actual parameters "scala.collection.Seq"; candidates are: "line29e7e4b1e36445baa3505b2e102aa86b29.$read$$iw$$iw$$iw$$iw$SpecificCollection(scala.collection.immutable.List)"
> {code}



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