[jira] [Commented] (SPARK-14767) Codegen "no constructor found" errors with Maps inside case classes in Datasets

["Mikael Ståldal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-14767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15689440#comment-15689440 ] 

Mikael Ståldal commented on SPARK-14767:
----------------------------------------

I have the same problem in Spark 2.0 when using [spark-avro|https://github.com/databricks/spark-avro] and trying to convert the DataFrame it generates to a DataSet with case classes generated with [Avrohugger|https://github.com/julianpeeters/avrohugger].

First I thought this was an [issue with spark-avro|https://github.com/databricks/spark-avro/issues/186], but spark-avro converts avro types to spark-sql-catalyst types, not directly to Scala types.

> Codegen "no constructor found" errors with Maps inside case classes in Datasets
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-14767
>                 URL: https://issues.apache.org/jira/browse/SPARK-14767
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Burak Yavuz
>            Priority: Critical
>
> When I have a `Map` inside a case class and am trying to use Datasets,
> the simplest operation throws an exception, because the generated code is looking for a constructor with `scala.collection.Map` whereas the constructor takes `scala.collection.immutable.Map`.
> To reproduce:
> {code}
> case class Bug(bug: Map[String, String])
> val ds = Seq(Bug(Map("name" -> "dummy"))).toDS()
> ds.map { b =>
>   b.bug.getOrElse("name", null)
> }.count()
> {code}
> Stacktrace:
> {code}
> Caused by: java.util.concurrent.ExecutionException: java.lang.Exception: failed to compile: org.codehaus.commons.compiler.CompileException: File 'generated.java', Line 163, Column 150: No applicable constructor/method found for actual parameters "scala.collection.Map"; candidates are: Bug(scala.collection.immutable.Map)"
> {code}



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