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  1. Spark
  2. SPARK-18891

Support for specific collection types

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Details

    • Improvement
    • Status: Resolved
    • Critical
    • Resolution: Fixed
    • 1.6.3, 2.1.0
    • 2.3.0
    • SQL
    • None

    Description

      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:

      case class SpecificCollection(aList: List[Int])
Seq(SpecificCollection(1 :: Nil)).toDS().collect()

      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)"

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        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SPARK-19104 CompileException with Map and Case Class in Spark 2.1.0

          • Major - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. SPARK-19434 Dataframe/Dataset unserialization failing with Map

          • Major - Major loss of function.
          • Resolved
          relates to

          Improvement - An improvement or enhancement to an existing feature or task. SPARK-19089 Support nested arrays/seqs in Datasets

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          links to

          Pull request #16986 [Github] Pull Request #16986 (michalsenkyr)

          Pull request #18009 [Github] Pull Request #18009 (michalsenkyr)

          Activity

            People

              michalsenkyr Michal Šenkýř
              marmbrus Michael Armbrust
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              Dates

                Created:
                Updated:
                Resolved: