Hi, The following code will work:
auto list = std::static_pointer_cast<arrow::ListArray>(data->chunk(0)); auto currentSeries = list->value_slice(rowIndex); Thanks, -- kou In <CAB0p=8Dh4CL8vDiBmyP36L8UEd=RiKghGJY=4krtv_hwa27...@mail.gmail.com> "Re: get element of ListArray as Array" on Thu, 13 Aug 2020 18:03:30 +0200, Kirill Lykov <lykov.kir...@gmail.com> wrote: > I think I found a way: > ``` > // data is arrow:ChunkedArray > auto list = > std::static_pointer_cast<arrow::ListArray>(data->chunk(0)); > auto values = list->values(); > auto startOffset = list->value_offset(rowIndex); > auto length = list->value_offset(idx + 1) - startOffset; > auto currentSerie = values->Slice(startOffset, length); > ``` > > On Thu, Aug 13, 2020 at 4:54 PM Kirill Lykov <lykov.kir...@gmail.com> wrote: >> >> I have a ChunkedArray of type `arrow::list` and I want to take a value >> for a particular row in this column and return it as Array. >> From example, I see one way of doing it -- get raw pointer using >> `values` method and also take `value_offset` to get offset. This way I >> will get pointers to the whole range. >> If this is the only way, can I somehow create a zero-copy arrow::Array >> from this range? >> >> -- >> Best regards, >> Kirill Lykov > > > > -- > Best regards, > Kirill Lykov
