- **Description**: Collects results from parallel workers. - **Performance**: Collects results from parallel workers. - **Factors**: Number of workers, communication overhead. - **Cost**: `parallel worker cost + inter-process communication cost` - ![[ex_gather_merge.svg|200x200]] - **Operates on**: [[Result Set]] - **Workloads**: - [[IPC]] - [[ExecuteGather]] - [[ParallelFinish]] - [[LWLock]] - [[ParallelQueryDSA]] - [[SharedTupleStore]]