Function CopyNonNullValues

cpp/src/arrow/compute/kernels/util_internal.h:115–127

// Copy numerical array values to a buffer, ignore nulls.
template <typename T>
ARROW_NOINLINE int64_t CopyNonNullValues(const ArraySpan& data, T* out) {
  const int64_t n = data.length - data.GetNullCount();
  if (n > 0) {
    int64_t index = 0;
    const T* values = data.GetValues<T>(1);
    arrow::internal::VisitSetBitRunsVoid(
        data.buffers[0].data, data.offset, data.length, [&](int64_t pos, int64_t len) {
          memcpy(out + index, values + pos, len * sizeof(T));
          index += len;
        });
  }
  return n;
}

template <typename T>
int64_t CopyNonNullValues(const ChunkedArray& arr, T* out) {