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Namit Jain commented on HIVE-1938:
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Yes, but do need column stats for this
> 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
> 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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