Thanks, looks really interesting. Do functions like matmul support inputs of differing type, like say A=int8 and B=float? Would be nice if you could get memory efficient quantized matmul with operator fusion.
I believe `count` will only give you the number of non-null rows, so the numbers from the first command could differ by column if there were null values. You can also use the `size` command to get the total number of rows, and that will return a `pd.Series` with or without a column specifier.