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https://issues.apache.org/jira/browse/HIVE-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai updated HIVE-4927:
---------------------------
Attachment: HIVE-4927.1.patch
> When we merge two MapJoin MapRedTasks, the TableScanOperator of the second
> one should be removed
> ------------------------------------------------------------------------------------------------
>
> Key: HIVE-4927
> URL: https://issues.apache.org/jira/browse/HIVE-4927
> Project: Hive
> Issue Type: Bug
> Reporter: Yin Huai
> Assignee: Yin Huai
> Attachments: HIVE-4927.1.patch
>
>
> {code}
> set hive.auto.convert.join=true;
> set hive.auto.convert.join.noconditionaltask=true;
> EXPLAIN
> SELECT x1.key AS key FROM src x1 JOIN src1 y1 ON (x1.key = y1.key) JOIN src1
> y2 ON (x1.value = y2.value) GROUP BY x1.key;
> {\code}
> We will get a NPE from MetadataOnlyOptimizer. The reason is that the operator
> tree of the MapRedTask evaluating two MapJoins is
> {code}
> TS1->MapJoin1->TS2->MapJoin2->...
> {\code}
> We should remove the TS2...
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