Uploaded image for project: 'MariaDB Connector/C'
  1. MariaDB Connector/C
  2. CONC-12

Support hash based aggregation method for GROUP BY

Details

    • Task
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Duplicate
    • None
    • None
    • None
    • None

    Description

      The current sort based GROUP BY implementation performs badly when source data is large and expected output is small. An alternative method, supported by Oracle, Postgres, SQL Server, etc. is to use hash aggregation, as described here: http://blogs.msdn.com/b/craigfr/archive/2006/09/20/hash-aggregate.aspx

      Attachments

        Activity

          Transition Time In Source Status Execution Times
          Elena Stepanova made transition -
          Open Closed
          		31m 40s 1

          People

            ratzpo Rasmus Johansson (Inactive)
            mjohnston Mathew Johnston
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Git Integration

                Error rendering 'com.xiplink.jira.git.jira_git_plugin:git-issue-webpanel'. Please contact your Jira administrators.