[jira] [Commented] (SPARK-15244) Type of column name created with sqlContext.createDataFrame() is not consistent.

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-15244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282546#comment-15282546 ] 

Dongjoon Hyun commented on SPARK-15244:
---------------------------------------

Hi, [~k-yokoshi]. 
I can fix this consistently. I'll make a PR for this.

> Type of column name created with sqlContext.createDataFrame() is not consistent.
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-15244
>                 URL: https://issues.apache.org/jira/browse/SPARK-15244
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 2.0.0
>         Environment: CentOS 7, Spark 1.6.0
>            Reporter: Kazuki Yokoishi
>            Priority: Minor
>
> StructField() converts field name to str in __init__.
> But, when list of str/unicode is passed to sqlContext.createDataFrame() as a schema, the type of StructField.name is not converted.
> To reproduce:
> {noformat}
> >>> schema = StructType([StructField(u"col", StringType())])
> >>> df1 = sqlContext.createDataFrame([("a",)], schema)
> >>> df1.columns # "col" is str
> ['col']
> >>> df2 = sqlContext.createDataFrame([("a",)], [u"col"])
> >>> df2.columns # "col" is unicode
> [u'col']
> {noformat}



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