[jira] [Assigned] (SPARK-21640) Method mode with String parameters within DataFrameWriter is error prone

["Xiao Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li reassigned SPARK-21640:
-------------------------------

    Assignee: Alberto

> Method mode with String parameters within DataFrameWriter is error prone
> ------------------------------------------------------------------------
>
>                 Key: SPARK-21640
>                 URL: https://issues.apache.org/jira/browse/SPARK-21640
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Alberto
>            Assignee: Alberto
>            Priority: Trivial
>             Fix For: 2.3.0
>
>
> The following method:
> {code:java}
> def mode(saveMode: String): DataFrameWriter[T]
> {code}
> sets the SaveMode of the DataFrameWriter depending on the string that is pass-in as parameter.
> There is a java Enum with all the save modes which are Append, Overwrite, ErrorIfExists and Ignore. In my current project I was writing some code that was using this enum to get the string value that I use to call the mode method:
> {code:java}
>   private[utils] val configModeAppend = SaveMode.Append.toString.toLowerCase
>   private[utils] val configModeErrorIfExists = SaveMode.ErrorIfExists.toString.toLowerCase
>   private[utils] val configModeIgnore = SaveMode.Ignore.toString.toLowerCase
>   private[utils] val configModeOverwrite = SaveMode.Overwrite.toString.toLowerCase
> {code}
> The configModeErrorIfExists val contains the value "errorifexists" and when I call the saveMode method using this string it does not match. I suggest to include "errorifexists" as a right match for the ErrorIfExists SaveMode.
> Will create a PR to address this issue ASAP.



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