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