[
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).
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
