diff options
Diffstat (limited to 'python/pyspark/sql/functions.py')
| -rw-r--r-- | python/pyspark/sql/functions.py | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/python/pyspark/sql/functions.py b/python/pyspark/sql/functions.py index 641220a264..692af868dd 100644 --- a/python/pyspark/sql/functions.py +++ b/python/pyspark/sql/functions.py @@ -51,6 +51,19 @@ def _create_function(name, doc=""): return _ +def _create_binary_mathfunction(name, doc=""): + """ Create a binary mathfunction by name""" + def _(col1, col2): + sc = SparkContext._active_spark_context + # users might write ints for simplicity. This would throw an error on the JVM side. + jc = getattr(sc._jvm.functions, name)(col1._jc if isinstance(col1, Column) else float(col1), + col2._jc if isinstance(col2, Column) else float(col2)) + return Column(jc) + _.__name__ = name + _.__doc__ = doc + return _ + + _functions = { 'lit': 'Creates a :class:`Column` of literal value.', 'col': 'Returns a :class:`Column` based on the given column name.', @@ -63,6 +76,34 @@ _functions = { 'sqrt': 'Computes the square root of the specified float value.', 'abs': 'Computes the absolute value.', + # unary math functions + 'acos': 'Computes the cosine inverse of the given value; the returned angle is in the range' + + '0.0 through pi.', + 'asin': 'Computes the sine inverse of the given value; the returned angle is in the range' + + '-pi/2 through pi/2.', + 'atan': 'Computes the tangent inverse of the given value.', + 'cbrt': 'Computes the cube-root of the given value.', + 'ceil': 'Computes the ceiling of the given value.', + 'cos': 'Computes the cosine of the given value.', + 'cosh': 'Computes the hyperbolic cosine of the given value.', + 'exp': 'Computes the exponential of the given value.', + 'expm1': 'Computes the exponential of the given value minus one.', + 'floor': 'Computes the floor of the given value.', + 'log': 'Computes the natural logarithm of the given value.', + 'log10': 'Computes the logarithm of the given value in Base 10.', + 'log1p': 'Computes the natural logarithm of the given value plus one.', + 'rint': 'Returns the double value that is closest in value to the argument and' + + ' is equal to a mathematical integer.', + 'signum': 'Computes the signum of the given value.', + 'sin': 'Computes the sine of the given value.', + 'sinh': 'Computes the hyperbolic sine of the given value.', + 'tan': 'Computes the tangent of the given value.', + 'tanh': 'Computes the hyperbolic tangent of the given value.', + 'toDegrees': 'Converts an angle measured in radians to an approximately equivalent angle ' + + 'measured in degrees.', + 'toRadians': 'Converts an angle measured in degrees to an approximately equivalent angle ' + + 'measured in radians.', + 'max': 'Aggregate function: returns the maximum value of the expression in a group.', 'min': 'Aggregate function: returns the minimum value of the expression in a group.', 'first': 'Aggregate function: returns the first value in a group.', @@ -74,10 +115,21 @@ _functions = { 'sumDistinct': 'Aggregate function: returns the sum of distinct values in the expression.', } +# math functions that take two arguments as input +_binary_mathfunctions = { + 'atan2': 'Returns the angle theta from the conversion of rectangular coordinates (x, y) to' + + 'polar coordinates (r, theta).', + 'hypot': 'Computes `sqrt(a^2^ + b^2^)` without intermediate overflow or underflow.', + 'pow': 'Returns the value of the first argument raised to the power of the second argument.' +} + for _name, _doc in _functions.items(): globals()[_name] = _create_function(_name, _doc) +for _name, _doc in _binary_mathfunctions.items(): + globals()[_name] = _create_binary_mathfunction(_name, _doc) del _name, _doc __all__ += _functions.keys() +__all__ += _binary_mathfunctions.keys() __all__.sort() |