Details

    • Type: Sub-task Sub-task
    • Status: Open
    • Priority: Major Major
    • Resolution: Unresolved
    • Affects Version/s: 0.14.0
    • Fix Version/s: None
    • Component/s: Query Processor, Statistics
    • Labels:
      None
    • Release Note:
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      During stats annotation column stats are updated based on ratio of change in number of rows. This heuristics can be improved by analyzing the filter expression and updating the column stats accordingly. For example: When filter expression is an equality to literal then NDV can be set to 1 directly. If the expression is an equality to column projection then min NDVs of the columns participating in expression can be taken.
      Show
      During stats annotation column stats are updated based on ratio of change in number of rows. This heuristics can be improved by analyzing the filter expression and updating the column stats accordingly. For example: When filter expression is an equality to literal then NDV can be set to 1 directly. If the expression is an equality to column projection then min NDVs of the columns participating in expression can be taken.

      Activity

      Prasanth Jayachandran created issue -
      Prasanth Jayachandran made changes -
      Field Original Value New Value
      Fix Version/s 0.13.0 [ 12324986 ]
      Prasanth Jayachandran made changes -
      Component/s Query Processor [ 12312586 ]
      Component/s Statistics [ 12314312 ]
      Navis made changes -
      Fix Version/s 0.14.0 [ 12326450 ]
      Fix Version/s 0.13.0 [ 12324986 ]
      Gunther Hagleitner made changes -
      Fix Version/s 0.14.0 [ 12326450 ]

        People

        • Assignee:
          Prasanth Jayachandran
          Reporter:
          Prasanth Jayachandran
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          Dates

          • Created:
            Updated:

            Development