[jira] [Closed] (TOREE-503) Cannot Use Scala Enumerations as Method Arguments

["Kevin Bates (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TOREE-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kevin Bates closed TOREE-503.
-----------------------------
    Fix Version/s: 0.3.0
         Assignee: Kevin Bates
       Resolution: Workaround

This appears to only be an issue if Toree is used on pre Spark 2.4 systems.  It cannot be reproduced on Spark 2.4+.  Since the same version of Toree is used in both cases, this implies this is probably something in Spark or some subtle variation related to the version of Spark.

I chose 'Workaround' because this issue can be worked around if the method and call to the method are in the same cell (for Spark < 2.4).  The other workaround is to upgrade to Spark 2.4, in which case the locality requirement is not applicable.

> Cannot Use Scala Enumerations as Method Arguments
> -------------------------------------------------
>
>                 Key: TOREE-503
>                 URL: https://issues.apache.org/jira/browse/TOREE-503
>             Project: TOREE
>          Issue Type: Bug
>          Components: Kernel
>    Affects Versions: 0.3.0
>         Environment: Amazon EMR Release emr-5.10.0, JupyterLab 0.35.4
>            Reporter: Alexander Gunter
>            Assignee: Kevin Bates
>            Priority: Major
>             Fix For: 0.3.0
>
>
> Under common circumstances, cells containing method calls where an argument is an Enumeration will fail to compile when using the Toree kernel in JupyterLab. The circumstances relate to the scoping between notebook cells. The arrangement below will fail to compile, producing the shown output.
>  
> _CELL 1:_
> {code:java}
> object ExampleEnum extends Enumeration {
>    type ExampleEnum = Value
>    val A, B, C = Value
>  }{code}
> {code:java}
> defined object ExampleEnum
> {code}
>  
> _CELL 2:_
> {code:java}
> def exampleMethod(enum: ExampleEnum.Value): Unit = {
>   println(enum.toString)
> }
> exampleMethod(ExampleEnum.A){code}
> {code:java}
> exampleMethod: (enum: ExampleEnum.Value)Unit
> A
> {code}
>  
> _CELL 3:_
> {code:java}
> exampleMethod(ExampleEnum.A){code}
> {code:java}
> Name: Compile Error
> Message: <console>:30: error: type mismatch;
>  found   : ExampleEnum.Value
>  required: ExampleEnum.Value
>        exampleMethod(ExampleEnum.A)
>                                  ^
> StackTrace: 
> {code}
>  
> Note that exampleMethod() works as expected when called inside the same cell as its definition (demo'd in Cell 2). It also works as expected in all cells if it is instead defined in Cell 1 alongside ExampleEnum (i.e. if you merge Cell1 and Cell 2).



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