[jira] [Assigned] (SPARK-22381) Add StringParam that supports valid options

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-22381:
------------------------------------

    Assignee:     (was: Apache Spark)

> Add StringParam that supports valid options
> -------------------------------------------
>
>                 Key: SPARK-22381
>                 URL: https://issues.apache.org/jira/browse/SPARK-22381
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML
>    Affects Versions: 2.2.0
>            Reporter: yuhao yang
>            Priority: Minor
>
> During test with https://issues.apache.org/jira/browse/SPARK-22331, I found it might be a good idea to include the possible options in a StringParam.
> A StringParam extends Param[String] and allow user to specify the valid options in Array[String] (case insensitive).
> So far it can help achieve three goals:
> 1. Make the StringParam aware of its possible options and support native validations.
> 2. StringParam can list the supported options when user input wrong value.
> 3. allow automatic unit test coverage for case-insensitive String param
> and IMO it also decrease the code redundancy.
> The StringParam is designed to be completely compatible with existing Param[String], just adding the extra logic for supporting options, which means we don't need to convert all Param[String] to StringParam until we feel comfortable to do that.
>     



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