Method getColumnByIndex

matlab/src/cpp/arrow/matlab/tabular/proxy/record_batch.cc:159–185

}

void RecordBatch::getColumnByIndex(libmexclass::proxy::method::Context& context) {
  namespace mda = ::matlab::data;

  mda::StructArray args = context.inputs[0];
  const mda::TypedArray<int32_t> index_mda = args[0]["Index"];
  const auto matlab_index = int32_t(index_mda[0]);

  // Note: MATLAB uses 1-based indexing, so subtract 1.
  // arrow::Schema::field does not do any bounds checking.
  const int32_t index = matlab_index - 1;
  const auto num_columns = record_batch->num_columns();

  if (num_columns == 0) {
    context.error = makeEmptyRecordBatchError();
    return;
  }

  if (matlab_index < 1 || matlab_index > num_columns) {
    context.error = makeInvalidNumericIndexError(matlab_index, num_columns);
    return;
  }

  const auto array = record_batch->column(index);
  MATLAB_ASSIGN_OR_ERROR_WITH_CONTEXT(context.outputs[0],
                                      arrow::matlab::proxy::wrap_and_manage(array),
                                      context, error::UNKNOWN_PROXY_FOR_ARRAY_TYPE);
}

void RecordBatch::getColumnByName(libmexclass::proxy::method::Context& context) {
  namespace mda = ::matlab::data;