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Review request for hive. Bugs: HIVE-6439 https://issues.apache.org/jira/browse/HIVE-6439 Repository: hive-git Description ------- 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. Diffs ----- common/src/java/org/apache/hadoop/hive/conf/HiveConf.java a182cd7 conf/hive-default.xml.template 0d08aa2 ql/src/java/org/apache/hadoop/hive/ql/QueryProperties.java 1ba5654 ql/src/java/org/apache/hadoop/hive/ql/optimizer/PreCBOOptimizer.java PRE-CREATION ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/CostBasedOptimizer.java PRE-CREATION ql/src/java/org/apache/hadoop/hive/ql/parse/ParseDriver.java 52c39c0 ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 77388dd Diff: https://reviews.apache.org/r/18172/diff/ Testing ------- Thanks, Harish Butani