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https://issues.apache.org/jira/browse/HIVE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989541#comment-12989541
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bharath v commented on HIVE-1938:
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So do I need to start working on collecting column-stats first and then
continue to join reordering ? Any hints or suggestions on where to start ?
> 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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