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From "Paul Yang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1393) Column pruner prunes essential columns in map join
Date Tue, 08 Jun 2010 00:51:11 GMT
Column pruner prunes essential columns in map join

                 Key: HIVE-1393
                 URL: https://issues.apache.org/jira/browse/HIVE-1393
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.6.0
            Reporter: Paul Yang

CREATE TABLE tmp_pyang_src2 (key STRING, value STRING);
INSERT OVERWRITE TABLE tmp_pyang_src2 SELECT key, value FROM src;

SELECT  /*+ MAPJOIN(a) */ a.key, a.value
FROM tmp_pyang_src2 a JOIN src b ON a.key=b.key

a.value will show up as null. Either removing the MAPJOIN hint or set hive.optimize.cp=false;
will produce the correct results.

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