Github user prasanthj commented on the issue:
https://github.com/apache/orc/pull/78
@dain Hive already uses stats API (reader side and writer side) to get
basic statistics like (numRows, rawDataSize, etc.) from the footer to avoid
row-by-row stats gathering. This new API is to extend the same for column
statistics (although ORC is missing NDV at this point).
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