A base class for unary functions.
Expression * clone() const
It creates a new copy of this expression.
StdDev statistical function.
StdDev statistical function.
UnaryFunction & operator=(const UnaryFunction &rhs)
TE_DEFINE_VISITABLE StdDev(Expression *arg)
Constructor.
This is an abstract class that models a query expression.
StdDev & operator=(const StdDev &rhs)