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Posted to issues@spark.apache.org by "Michal Šenkýř (JIRA)" <ji...@apache.org> on 2016/12/17 11:18:58 UTC
[jira] [Comment Edited] (SPARK-18891) Support for specific
collection types
[ https://issues.apache.org/jira/browse/SPARK-18891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15756842#comment-15756842 ]
Michal Šenkýř edited comment on SPARK-18891 at 12/17/16 11:18 AM:
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[PR #16240|https://github.com/apache/spark/pull/16240] should be relevant. It adds encoders and deserialization support for arbitrary sequence types (serialization was already supported). The only thing not working yet is the {{Seq.toDS}} method due to implicits resolution ({{SparkSession.createDataset}} works fine).
was (Author: michalsenkyr):
[PR #16240|https://github.com/apache/spark/pull/16240] should be relevant. It adds deserialization support for arbitrary sequence types (serialization was already supported). The only thing not working yet is the {{Seq.toDS}} method due to implicits resolution ({{SparkSession.createDataset}} works fine).
> 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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