def pyarrow_meth(data, skipna, **kwargs):
numerator = pc.stddev(data, skip_nulls=skipna, **kwargs)
denominator = pc.sqrt_checked(
pc.subtract_checked(
pc.count(self._data, skip_nulls=skipna),
kwargs["ddof"]))
return pc.divide_checked(numerator, denominator)
def binary_col(op, l, r):
"""
interpretor for executing binary operator expressions
"""
if op == "+": return compute.add_checked(l, r)
if op == "*": return compute.multiply_checked(l, r)
if op == '-': return compute.subtract_checked(l, r)
if op == "=": return compute.equal(l, r)
if op == "<>": return compute.not_equal(l, r)
if op == "!=": return compute.not_equal(l, r)
if op == "or": return compute.or_(l, r)
if op == "<": return compute.less(l, r)
if op == ">": return compute.greater(l, r)
if op == "/": return compute.divide_checked(l, r)
if op == "and": return compute.and_(l, r)
if op == "in": return compute.is_in(l, r)
if op == "==": return compute.equal(l, r)
if op == "<=": return compute.less_equal(l, r)
if op == ">=": return compute.greater_equal(l, r)
raise Exception("binary op not implemented")
result = pc.floor(pc.divide_checked(left, right))
if pa.types.is_integer(left.type) and pa.types.is_integer(right.type):
result = result.cast(left.type)
return result
ARROW_ARITHMETIC_FUNCS = {
"add":
NotImplemented if pa_version_under2p0 else pc.add_checked,
"radd":
NotImplemented
if pa_version_under2p0 else lambda x, y: pc.add_checked(y, x),
"sub":
NotImplemented if pa_version_under2p0 else pc.subtract_checked,
"rsub":
NotImplemented
if pa_version_under2p0 else lambda x, y: pc.subtract_checked(y, x),
"mul":
NotImplemented if pa_version_under2p0 else pc.multiply_checked,
"rmul":
NotImplemented
if pa_version_under2p0 else lambda x, y: pc.multiply_checked(y, x),
"truediv":
NotImplemented if pa_version_under2p0 else
lambda x, y: pc.divide_checked(cast_for_truediv(x, y), y),
"rtruediv":
NotImplemented if pa_version_under2p0 else
lambda x, y: pc.divide_checked(y, cast_for_truediv(x, y)),
"floordiv":
NotImplemented
if pa_version_under2p0 else lambda x, y: floordiv_compat(x, y),
"rfloordiv":