I'm trying to implement something along the lines of "X if Y > Z", but treating the case of Y or Z as null as "false". Interestingly, this is difficult with the way the kernels are created:
1. `Y > Z` will treat `null > ???` as null. "Perform left > right operation on two arrays. Non-null values are greater than null values." 2. Ok, so maybe we write that as `(Y > Z) && not_null(Y)`. "If either left or right value is null then the result is also null." Oh. So if the LHS is null, there is *no way* to get a boolean array with a non-null value. 3. Ok, I'll go write my own operator to do this (`null_to_false` or something like that). I can do this, but it requires iterating over the booleans and combining them. It seems like it would be easy to do using `buffer_bin_and`, but that is only visible within the Arrow crate. First, am I missing something with the above analysis? Is there some way to provide non-null values for a boolean array that has nulls? Second, if not any thoughts on a solution? The two options I see (without changing behavior of existing kernels) would be: 1. Add kernel(s) that provide a value in place of `null` (a general case of the `null_to_false`). These could be specialized in the boolean case to use the `buffer_bin_and` as appropriate. 2. Expose the `buffer_bin_and` and `buffer_bin_or` methods so that I (as a user) can write the kernel myself.
