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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