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From "Srinivasan Sembakkam Rajivelu (Commented) (JIRA)" <>
Subject [jira] [Commented] (HIVE-1938) Cost Based Query optimization for Joins in Hive
Date Thu, 22 Mar 2012 19:16:22 GMT


Srinivasan Sembakkam Rajivelu commented on HIVE-1938:

       Still you are working with this ticket. I am interested in doing join optimization
in Hive. I am also interested in the idea of implementing statistics in Hive. Does it implemented??

If you are not working I can take this ticket and work or Suggest me some ticket related to
this, so that I can take it up and work.
> Cost Based Query optimization for Joins in Hive
> -----------------------------------------------
>                 Key: HIVE-1938
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor, Statistics
>         Environment: *nix,java
>            Reporter: bharath v
>            Assignee: bharath v
> 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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