@Override
    public boolean equals(Object o) {
        if (o == this) {
            return true;
        } else if (o instanceof WindowFunction) {
            WindowFunction<?> so = (WindowFunction<?>) o;
            return so.target.equals(target)
                && so.partitionBy.equals(partitionBy)
                && so.orderBy.equals(orderBy);
        } else {
            return false;
        }
    }
{@code WindowFunction} is a builder for window function expressions

@param <A> expression type

@author tiwe
querydsl-sql/src/main/java/com/querydsl/sql/WindowFunction.java