Yin, has done an amazing job with new features to hive's planner and
optimizer. He has started reviewing issues of others. Additionally he is
finding edge-case bugs in current features.
His multi-year effort on https://issues.apache.org/jira/browse/HIVE-2206 is
an impressive body of work and example of great determination.
Edward Capriolo 2013-08-31, 15:07