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https://issues.apache.org/jira/browse/SPARK-18891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-18891:
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Assignee: (was: Apache Spark)
> 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
> Fix For: 2.2.0
>
>
> 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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