Harish Butani created HIVE-6439:
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Summary: 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
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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