Uploaded image for project: 'Hive'
  1. Hive
  2. HIVE-3667 Umbrella jira for Correlation Optimizer
  3. HIVE-3668

Merge MapReduce jobs which share input tables and the same partitioning keys into a single MapReduce job

    XMLWordPrintableJSON

    Details

    • Type: Sub-task
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Query Processor
    • Labels:
      None

      Description

      In the plan of a query, if there exists MapReduce jobs created for aggregation operators or join operators which share one or more input tables and use the same partitioning keys to shuffle the data, these jobs can be merged into a single MapReduce job. Shared tables will be only scanned once.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                yhuai Yin Huai
                Reporter:
                yhuai Yin Huai
              • Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                • Created:
                  Updated: