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(Updated Nov. 11, 2014, 10:34 p.m.) Review request for hive, Ashutosh Chauhan and Vikram Dixit Kumaraswamy. Repository: hive-git Description ------- On Hive 14 when CBO is enabled the column names are missing from the join expression. Rather than to use external names "key", "value", some internal names such as "_col0" or "_col1" are used. For map join with more than two tables it is very hard to figure the actual join order. In this patch, I am going to address this issue not only for join but also for all the other operators. And it will also be addressed in not only CLI but also TEZ environment. The basic idea to transform the internal name to external name is to (1) use snapshotLogicalPlanForExplain() to make a snapshot of a logical plan after logical optimization (2) for each operator in the explain task, call the prepareCBOExplain function for each operatorDesc (2.1) Each operator uses ''helpGetStartOp'' to map to a logical operator (start point) in the LogicalPlan (2.2) From start point, each operatorDesc uses ''findExternalName'' to track its external name And, an important assumption here is that, every physical operator (SEL, RS, JOIN (include hashtablesinkop, join, mapjoinop, mergejoinop, semijoin), FIL, GRY, FS, UNION) that is included in the explain can find its corresponding logical operator. If it is not found, its internal column names will be used. Diffs (updated) ----- common/src/java/org/apache/hadoop/hive/conf/HiveConf.java cca57d2 ql/src/java/org/apache/hadoop/hive/ql/exec/ExplainTask.java 8e1ba48 ql/src/java/org/apache/hadoop/hive/ql/optimizer/AbstractSMBJoinProc.java c9e8086 ql/src/java/org/apache/hadoop/hive/ql/optimizer/ConvertJoinMapJoin.java 04bafda ql/src/java/org/apache/hadoop/hive/ql/optimizer/MapJoinProcessor.java 2d82cd8 ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/CommonJoinTaskDispatcher.java 3df1c26 ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/LocalMapJoinProcFactory.java 9076d48 ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/Vectorizer.java 2c02bd4 ql/src/java/org/apache/hadoop/hive/ql/parse/ExplainColumnContext.java PRE-CREATION ql/src/java/org/apache/hadoop/hive/ql/parse/ParseContext.java 8215c26 ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 88fd0fc ql/src/java/org/apache/hadoop/hive/ql/parse/TaskCompiler.java 23fbbe1 ql/src/java/org/apache/hadoop/hive/ql/plan/AbstractOperatorDesc.java 8410664 ql/src/java/org/apache/hadoop/hive/ql/plan/FileSinkDesc.java 8b25c2b ql/src/java/org/apache/hadoop/hive/ql/plan/FilterDesc.java 5856743 ql/src/java/org/apache/hadoop/hive/ql/plan/GroupByDesc.java 7a0b0da ql/src/java/org/apache/hadoop/hive/ql/plan/HashTableSinkDesc.java 1e0eb6b ql/src/java/org/apache/hadoop/hive/ql/plan/JoinDesc.java 0e2c6ee ql/src/java/org/apache/hadoop/hive/ql/plan/MapJoinDesc.java d43bd60 ql/src/java/org/apache/hadoop/hive/ql/plan/OperatorDesc.java c8c9570 ql/src/java/org/apache/hadoop/hive/ql/plan/ReduceSinkDesc.java 57beb69 ql/src/java/org/apache/hadoop/hive/ql/plan/SelectDesc.java fa6b548 ql/src/test/queries/clientpositive/explainColTest_1.q PRE-CREATION ql/src/test/queries/clientpositive/explainColTest_2.q PRE-CREATION ql/src/test/results/clientpositive/explainColTest_1.q.out PRE-CREATION ql/src/test/results/clientpositive/explainColTest_2.q.out PRE-CREATION ql/src/test/results/clientpositive/tez/explainColTest_1.q.out PRE-CREATION ql/src/test/results/clientpositive/tez/explainColTest_2.q.out PRE-CREATION Diff: https://reviews.apache.org/r/27415/diff/ Testing ------- Thanks, pengcheng xiong
