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

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

Michael Armbrust created SPARK-18891:
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             Summary: 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
            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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