ArrowErrorCode ArrowArrayViewInitFromSchema()

in src/nanoarrow/array.c [537:597]
53 lines of code
12 McCabe index (conditional complexity)

ArrowErrorCode ArrowArrayViewInitFromSchema(struct ArrowArrayView* array_view,
                                            struct ArrowSchema* schema,
                                            struct ArrowError* error) {
  struct ArrowSchemaView schema_view;
  int result = ArrowSchemaViewInit(&schema_view, schema, error);
  if (result != NANOARROW_OK) {
    return result;
  }

  ArrowArrayViewInitFromType(array_view, schema_view.storage_type);
  array_view->layout = schema_view.layout;

  result = ArrowArrayViewAllocateChildren(array_view, schema->n_children);
  if (result != NANOARROW_OK) {
    ArrowErrorSet(error, "ArrowArrayViewAllocateChildren() failed");
    ArrowArrayViewReset(array_view);
    return result;
  }

  for (int64_t i = 0; i < schema->n_children; i++) {
    result =
        ArrowArrayViewInitFromSchema(array_view->children[i], schema->children[i], error);
    if (result != NANOARROW_OK) {
      ArrowArrayViewReset(array_view);
      return result;
    }
  }

  if (schema->dictionary != NULL) {
    result = ArrowArrayViewAllocateDictionary(array_view);
    if (result != NANOARROW_OK) {
      ArrowArrayViewReset(array_view);
      return result;
    }

    result =
        ArrowArrayViewInitFromSchema(array_view->dictionary, schema->dictionary, error);
    if (result != NANOARROW_OK) {
      ArrowArrayViewReset(array_view);
      return result;
    }
  }

  if (array_view->storage_type == NANOARROW_TYPE_SPARSE_UNION ||
      array_view->storage_type == NANOARROW_TYPE_DENSE_UNION) {
    array_view->union_type_id_map = (int8_t*)ArrowMalloc(256 * sizeof(int8_t));
    if (array_view->union_type_id_map == NULL) {
      return ENOMEM;
    }

    memset(array_view->union_type_id_map, -1, 256);
    int8_t n_type_ids = _ArrowParseUnionTypeIds(schema_view.union_type_ids,
                                                array_view->union_type_id_map + 128);
    for (int8_t child_index = 0; child_index < n_type_ids; child_index++) {
      int8_t type_id = array_view->union_type_id_map[128 + child_index];
      array_view->union_type_id_map[type_id] = child_index;
    }
  }

  return NANOARROW_OK;
}