| Name | Description | Type | Package | Framework |
| ReduceSinkDeDuplication | If two reducer sink operators share the same partition/sort columns and order, they can be merged. | Class | org.apache.hadoop.hive.ql.optimizer.correlation | Apache Hive |
| ReduceSinkDeDuplication .AbsctractReducerReducerProc | Class | org.apache.hadoop.hive.ql.optimizer.correlation.ReduceSinkDeDuplication | Apache Hive | |