Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/19234
  
    I think it was changed back in https://github.com/apache/spark/pull/7363. I 
think that avoids precision loss from Python's `float` limitation:
    
    ```python
    >>> decimal.Decimal(1 / 1e6)
    
Decimal('9.99999999999999954748111825886258685613938723690807819366455078125E-7')
    >>> decimal.Decimal(1 / 100000)
    Decimal('0')
    >>> decimal.Decimal(1 / 100000.)
    
Decimal('0.000010000000000000000818030539140313095458623138256371021270751953125')
    ```
    
    Also, I think `//` is used for Python 3 behaviour:
    
    ```python
    >>> 5 / 2
    2.5
    >>> 5 // 2
    2
    ```


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