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https://issues.apache.org/jira/browse/HIVE-1393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878441#action_12878441
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He Yongqiang commented on HIVE-1393:
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Paul, i can not reproduce the problem. (I am using the current trunk.)
> 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
>
> Run:
> {code}
> 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
> LIMIT 10;
> {code}
> 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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