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https://issues.apache.org/jira/browse/SPARK-1199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011492#comment-14011492
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Michael Malak commented on SPARK-1199:
--------------------------------------
See also additional test cases in
https://issues.apache.org/jira/browse/SPARK-1836 which has now been marked as a
duplicate.
> Type mismatch in Spark shell when using case class defined in shell
> -------------------------------------------------------------------
>
> Key: SPARK-1199
> URL: https://issues.apache.org/jira/browse/SPARK-1199
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 0.9.0
> Reporter: Andrew Kerr
> Priority: Critical
> Fix For: 1.1.0
>
>
> Define a class in the shell:
> {code}
> case class TestClass(a:String)
> {code}
> and an RDD
> {code}
> val data = sc.parallelize(Seq("a")).map(TestClass(_))
> {code}
> define a function on it and map over the RDD
> {code}
> def itemFunc(a:TestClass):TestClass = a
> data.map(itemFunc)
> {code}
> Error:
> {code}
> <console>:19: error: type mismatch;
> found : TestClass => TestClass
> required: TestClass => ?
> data.map(itemFunc)
> {code}
> Similarly with a mapPartitions:
> {code}
> def partitionFunc(a:Iterator[TestClass]):Iterator[TestClass] = a
> data.mapPartitions(partitionFunc)
> {code}
> {code}
> <console>:19: error: type mismatch;
> found : Iterator[TestClass] => Iterator[TestClass]
> required: Iterator[TestClass] => Iterator[?]
> Error occurred in an application involving default arguments.
> data.mapPartitions(partitionFunc)
> {code}
> The behavior is the same whether in local mode or on a cluster.
> This isn't specific to RDDs. A Scala collection in the Spark shell has the
> same problem.
> {code}
> scala> Seq(TestClass("foo")).map(itemFunc)
> <console>:15: error: type mismatch;
> found : TestClass => TestClass
> required: TestClass => ?
> Seq(TestClass("foo")).map(itemFunc)
> ^
> {code}
> When run in the Scala console (not the Spark shell) there are no type
> mismatch errors.
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