Because FileReader::ReadColumn(int i, std::shared_ptr<Array>* out) is deprecated since 0.12.
https://github.com/apache/arrow/pull/3171/files#diff-e6f49fbed784ef27e3ab0075e01a5871R132
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Because FileReader::ReadColumn(int i, std::shared_ptr<Array>* out) is deprecated since 0.12.
https://github.com/apache/arrow/pull/3171/files#diff-e6f49fbed784ef27e3ab0075e01a5871R132