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https://issues.apache.org/jira/browse/SPARK-12467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994748#comment-15994748
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Maciej Szymkiewicz edited comment on SPARK-12467 at 5/3/17 12:55 PM:
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Python before 3.6 does not preserve the order of the keyword arguments (PEP
468) so without sorting keyword variant becomes nondeterministic.
was (Author: zero323):
Python before 3.6 does not preserve the order of the keyword arguments (PEP
468) so without sorting keyword becomes nondeterministic,
> Get rid of sorting in Row's constructor in pyspark
> --------------------------------------------------
>
> Key: SPARK-12467
> URL: https://issues.apache.org/jira/browse/SPARK-12467
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 1.5.2
> Reporter: Irakli Machabeli
> Priority: Minor
>
> Current implementation of Row's __new__ sorts columns by name
> First of all there is no obvious reason to sort, second, if one converts
> dataframe to rdd and than back to dataframe, order of column changes. While
> this is not a bug, nevetheless it makes looking at the data really
> inconvenient.
> def __new__(self, *args, **kwargs):
> if args and kwargs:
> raise ValueError("Can not use both args "
> "and kwargs to create Row")
> if args:
> # create row class or objects
> return tuple.__new__(self, args)
> elif kwargs:
> # create row objects
> names = sorted(kwargs.keys()) # just get rid of sorting here!!!
> row = tuple.__new__(self, [kwargs[n] for n in names])
> row.__fields__ = names
> return row
> else:
> raise ValueError("No args or kwargs")
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