If it is possible that the stats are set but not the new `min_value` and `max_value`, I think we should change that line ( https://github.com/apache/parquet-cpp/blob/master/src/parquet/metadata.cc#L57) from `true` to `metadata.statistics.__isset.max_value || metadata.statistics.__isset.min_value`. I can't recall why that is set to `true` always.
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