[jira] [Updated] (HIVE-1938) Cost Based Query optimization for Joins in Hive

["Carl Steinbach (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl Steinbach updated HIVE-1938:
---------------------------------

    Component/s: Statistics
    
> Cost Based Query optimization for Joins in Hive
> -----------------------------------------------
>
>                 Key: HIVE-1938
>                 URL: https://issues.apache.org/jira/browse/HIVE-1938
>             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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