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https://issues.apache.org/jira/browse/HIVE-2206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190147#comment-13190147
]
Kevin Wilfong commented on HIVE-2206:
-------------------------------------
I tried running
explain select * from (select * from src distribute by key sort by key) a join
src b on a.key = b.key;
using HIVE-2206.8.r1224646.patch.txt and I get the following exception:
FAILED: Hive Internal Error:
java.lang.ClassCastException(org.apache.hadoop.hive.ql.exec.SelectOperator
cannot be cast to org.apache.hadoop.hive.ql.exec.ReduceSinkOperator)
java.lang.ClassCastException: org.apache.hadoop.hive.ql.exec.SelectOperator
cannot be cast to org.apache.hadoop.hive.ql.exec.ReduceSinkOperator
at
org.apache.hadoop.hive.ql.optimizer.CorrelationOptimizer$CorrelationNodeProc.findPeerReduceSinkOperators(CorrelationOptimizer.java:256)
at
org.apache.hadoop.hive.ql.optimizer.CorrelationOptimizer$CorrelationNodeProc.process(CorrelationOptimizer.java:503)
at
org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:125)
at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
at
org.apache.hadoop.hive.ql.optimizer.CorrelationOptimizer.transform(CorrelationOptimizer.java:193)
at
org.apache.hadoop.hive.ql.optimizer.Optimizer.optimize(Optimizer.java:100)
at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:7384)
at
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:243)
at
org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:50)
at
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:243)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:430)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:889)
at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:255)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> add a new optimizer for query correlation discovery and optimization
> --------------------------------------------------------------------
>
> Key: HIVE-2206
> URL: https://issues.apache.org/jira/browse/HIVE-2206
> Project: Hive
> Issue Type: New Feature
> Reporter: He Yongqiang
> Assignee: Yin Huai
> Attachments: HIVE-2206.1.patch.txt, HIVE-2206.2.patch.txt,
> HIVE-2206.3.patch.txt, HIVE-2206.4.patch.txt, HIVE-2206.5-1.patch.txt,
> HIVE-2206.5.patch.txt, HIVE-2206.6.patch.txt, HIVE-2206.7.patch.txt,
> HIVE-2206.8.r1224646.patch.txt, YSmartPatchForHive.patch, testQueries.2.q
>
>
> reference:
> http://www.cse.ohio-state.edu/hpcs/WWW/HTML/publications/papers/TR-11-7.pdf
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