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  1. MariaDB ColumnStore
  2. MCOL-5191

Join Optimizer: histogram statistics/ needed for cost-based optimization

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    Details

    • Type: Task
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 23.02
    • Component/s: ExeMgr, PrimProc
    • Labels:
      None
    • Sprint:
      2021-17, 2022-22

      Description

      The previous step delivers a statistics that allows to detect uniqueness of a column to be able to cut lops in a JOIN graph the most effective way.
      The current step will deliver a histogram collected for columns of tables. The strained goal is to collect a Number of Dictinct Values statistics also.
      In the scope of this project the mentioned statistics collection is a manual operation and run by ANALYZE TABLE command as previously.

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              Assignee:
              denis0x0D Denis Khalikov
              Reporter:
              drrtuy Roman
              Assigned for Review:
              Roman Roman
              Assigned for Testing:
              Daniel Lee Daniel Lee
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              Watchers:
              3 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

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