Function AllocateDataBuffer

cpp/src/arrow/compute/exec.cc:268–276

namespace {

Result<std::shared_ptr<Buffer>> AllocateDataBuffer(KernelContext* ctx, int64_t length,
                                                   int bit_width) {
  if (bit_width == 1) {
    return ctx->AllocateBitmap(length);
  } else {
    int64_t buffer_size = bit_util::BytesForBits(length * bit_width);
    return ctx->Allocate(buffer_size);
  }
}

struct BufferPreallocation {
  explicit BufferPreallocation(int bit_width = -1, int added_length = 0)