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https://issues.apache.org/jira/browse/HIVE-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909040#comment-13909040
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Ashutosh Chauhan commented on HIVE-6439:
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Is plan to get CBO optimizer work in 0.13 timeframe? If no, I think we may want
to delay this till branching 0.13 Otherwise, this will go in 0.13 release with
a config which doesn't do anything and thus will be confusing for end users.
> Introduce CBO step in Semantic Analyzer
> ---------------------------------------
>
> Key: HIVE-6439
> URL: https://issues.apache.org/jira/browse/HIVE-6439
> Project: Hive
> Issue Type: Sub-task
> Reporter: Harish Butani
> Assignee: Harish Butani
> Attachments: HIVE-6439.1.patch, HIVE-6439.2.patch, HIVE-6439.4.patch,
> HIVE-6439.5.patch
>
>
> This patch introduces CBO step in SemanticAnalyzer. For now the
> CostBasedOptimizer is an empty shell.
> The contract between SemAly and CBO is:
> - CBO step is controlled by the 'hive.enable.cbo.flag'.
> - When true Hive SemAly will hand CBO a Hive Operator tree (with operators
> annotated with stats). If it can CBO will return a better plan in Hive AST
> form.
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