wjones127 commented on a change in pull request #11855:
URL: https://github.com/apache/arrow/pull/11855#discussion_r770819730
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File path: cpp/src/arrow/array/builder_nested.h
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@@ -329,9 +329,7 @@ class ARROW_EXPORT MapBuilder : public ArrayBuilder {
/// the Map to be built as a list of struct values.
ArrayBuilder* value_builder() const { return list_builder_->value_builder();
}
- std::shared_ptr<DataType> type() const override {
- return map(key_builder_->type(), item_builder_->type(), keys_sorted_);
- }
+ std::shared_ptr<DataType> type() const override { return type_; }
Review comment:
@pitrou I've updated this part to rebuild the type with the child
builders and the saved field names.
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