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Michal Šenkýř commented on SPARK-18891:
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Started my work on Map support as there is still no progress on the optimization PR for Seq.
I chose the builder approach as it seemed more straightforward. I will keep the Map implementation
seperate from the Seq one to have it working even in case the Seq PR doesn't get approved.
> 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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