在PySpark中，重新分区模块具有一个可选的column参数，该参数当然将通过该键对您的数据框进行重新分区。
我的问题是-没有钥匙时，Spark如何重新分区？我无法进一步深入研究源代码，以找到通过Spark本身进行处理的地方。
def repartition(self, numPartitions, *cols):
"""
Returns a new :class:`DataFrame` partitioned by the given partitioning expressions. The
resulting DataFrame is hash partitioned.
:param numPartitions:
can be an int to specify the target number of partitions or a Column.
If it is a Column, it will be used as the first partitioning column. If not specified,
the default number of partitions is used.
.. versionchanged:: 1.6
Added optional arguments to specify the partitioning columns. Also made numPartitions
optional if partitioning …