Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Some operations might need that null==null gives back true instead of null.

apache/datafusion#6724

Describe the solution you'd like

An equality kernel with null==null -> true.

Describe alternatives you've considered

In the PR apache/datafusion#6724 an alternative implementation can be found:

            let eq: BooleanArray = eq_dyn(left, right)?;

            let left_is_null = is_null(left)?;
            let right_is_null = is_null(right)?;

            or_kleene(&and(&left_is_null, &right_is_null)?, &eq)

Additional context