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https://issues.apache.org/jira/browse/HIVE-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harish Butani updated HIVE-6439:
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Attachment: HIVE-6439.2.patch
> 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
>
>
> 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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