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https://issues.apache.org/jira/browse/SPARK-21640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240298#comment-16240298
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Apache Spark commented on SPARK-21640:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/19673
> 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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