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https://reviews.apache.org/r/1132/
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Review request for hive and Siying Dong.


Summary
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A query should run in local mode when block sampling is used and the sample is 
small enough.  The size of the sample is currently being estimated, as it is 
done to estimate the number of reducers.


This addresses bug HIVE-2282.
    https://issues.apache.org/jira/browse/HIVE-2282


Diffs
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  ql/src/test/queries/clientpositive/sample_islocalmode_hook.q PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/exec/MapRedTask.java 53769a0 
  ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java cd3de76 
  ql/src/test/org/apache/hadoop/hive/ql/hooks/VerifyIsLocalModeHook.java 
PRE-CREATION 

Diff: https://reviews.apache.org/r/1132/diff


Testing
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TestCliDriver TestNegativeCliDriver, manually tested


Thanks,

Kevin

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