jorisvandenbossche commented on a change in pull request #12505:
URL: https://github.com/apache/arrow/pull/12505#discussion_r813950854
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File path: cpp/src/arrow/python/arrow_to_pandas.cc
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@@ -656,8 +656,19 @@ Status ConvertStruct(PandasOptions options, const
ChunkedArray& data,
// Convert the struct arrays first
for (int32_t i = 0; i < num_fields; i++) {
const auto field = arr->field(static_cast<int>(i));
- RETURN_NOT_OK(ConvertArrayToPandas(options, field, nullptr,
- fields_data[i +
fields_data_offset].ref()));
+ // In case the field is an extension array, use .storage() to convert to
Pandas
+ if (field->type()->id() == Type::EXTENSION){
+ // Save the field object as an Extension Array
+ const ExtensionArray& arr_ext = checked_cast<const
ExtensionArray&>(*field);
+ // Save the storage Array and use it to convert to Pandas
+ const std::shared_ptr<Array> field_ext = arr_ext.storage();
+ RETURN_NOT_OK(ConvertArrayToPandas(options, field_ext, nullptr,
+ fields_data[i +
fields_data_offset].ref()));
+ }
+ else{
+ RETURN_NOT_OK(ConvertArrayToPandas(options, field, nullptr,
+ fields_data[i +
fields_data_offset].ref()));
+ }
Review comment:
Ah, yes, that does the trick, thanks! (we were actually thinking that
the `const` disallowed updating what `field` was pointing to, but didn't think
about removing the const :))
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