Hi John, Arrays have a `Slice()` method that allows getting a zero-copy slices of the array given an offset and a length. If you had a set of ranges it wouldn't be too hard to write a function that creates a new chunked array made up of these slices.
Of course, there are likely cases where the overhead of creating lots of slices costs more than materializing a whole new array. You wouldn't want to get back a chunked array of length 1000 that is made up of 500 sliced arrays. This is even more true if you are taking indices. I think that's why no one has implemented such a function; it's complicated to detect when making a zero-copy slice is better than creating a new array, so we always just create a new array for take. But if you have a particular use case where you know it makes sense, then I would go ahead and write a function for that specific case. Best, Will On Tue, Mar 28, 2023 at 10:14 AM John Muehlhausen <j...@jgm.org> wrote: > Is there a way to pass a RecordBatch (or a batch wrapped as a Table) to > Take and get back a Table composed of in-place (zero copy) slices of the > input? I suppose this is not too hard to code, just wondered if there is > already a utility. > > Result<Datum> Take(const Datum& values, const Datum& indices, > const TakeOptions& options = TakeOptions::Defaults(), > ExecContext* ctx = NULLPTR); >
