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From gatorsmile <...@git.apache.org>
Subject [GitHub] spark pull request #17077: [SPARK-16931][PYTHON][SQL] Add Python wrapper for...
Date Sun, 07 May 2017 17:52:57 GMT
Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17077#discussion_r115149598
  
    --- Diff: python/pyspark/sql/readwriter.py ---
    @@ -563,6 +563,63 @@ def partitionBy(self, *cols):
             self._jwrite = self._jwrite.partitionBy(_to_seq(self._spark._sc, cols))
             return self
     
    +    @since(2.3)
    +    def bucketBy(self, numBuckets, col, *cols):
    +        """Buckets the output by the given columns.If specified,
    +        the output is laid out on the file system similar to Hive's bucketing scheme.
    +
    +        :param numBuckets: the number of buckets to save
    +        :param col: a name of a column, or a list of names.
    +        :param cols: additional names (optional). If `col` is a list it should be empty.
    +
    +        .. note:: Applicable for file-based data sources in combination with
    +                  :py:meth:`DataFrameWriter.saveAsTable`.
    --- End diff --
    
    This is not accurate. We also can use `save` to store the bucked tables without saving
its metadata in metastore. 


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