Hive
  1. Hive
  2. HIVE-1938

Cost Based Query optimization for Joins in Hive

    Details

    • Type: Improvement Improvement
    • Status: Open
    • Priority: Major Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Query Processor, Statistics
    • Labels:
      None
    • Environment:

      *nix,java

    • Tags:
      Query optimization . Query processor

      Description

      Current optimization in Hive is just rule-based and involves applying a set of rules on the Plan tree. This depends on hints given by the user (which may or may-not be correct) and might result in execution of costlier plans.So this jira aims at building a cost-model which can give a good estimate various plans before hand (using some meta-data already collected) and we can choose the best plan which incurs the least cost.

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            People

            • Assignee:
              bharath v
              Reporter:
              bharath v
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              Dates

              • Created:
                Updated:

                Development