Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/2252#issuecomment-55799882
For reference, how does this implementation of `POWER()` differ from [SQL
Server's](http://msdn.microsoft.com/en-us/library/ms174276.aspx)?
> **Syntax**
POWER ( float_expression , y )
**Arguments**
_float_expression_: Is an expression of type float or of a type that can be
implicitly converted to float.
_y_: Is the power to which to raise _float_expression_. _y_ can be an
expression of the exact numeric or approximate numeric data type category,
except for the bit data type.
**Return Types**
Returns the same type as submitted in _float_expression_. For example, if a
**decimal**(2,0) is submitted as _float_expression_, the result returned is
**decimal**(2,0).
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