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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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Phabricator updated HIVE-4927:
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Attachment: HIVE-4927.D11811.3.patch
yhuai updated the revision "HIVE-4927 [jira] When we merge two MapJoin
MapRedTasks, the TableScanOperator of the second one should be removed".
generate the correct diff. The last one is not based on the latest trunk
Reviewers: JIRA
REVISION DETAIL
https://reviews.facebook.net/D11811
CHANGE SINCE LAST DIFF
https://reviews.facebook.net/D11811?vs=36183&id=36189#toc
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/CommonJoinTaskDispatcher.java
ql/src/test/results/clientpositive/auto_join13.q.out
ql/src/test/results/clientpositive/auto_join2.q.out
ql/src/test/results/clientpositive/auto_join22.q.out
ql/src/test/results/clientpositive/auto_sortmerge_join_12.q.out
ql/src/test/results/clientpositive/join28.q.out
ql/src/test/results/clientpositive/join32.q.out
ql/src/test/results/clientpositive/join33.q.out
ql/src/test/results/clientpositive/join_star.q.out
ql/src/test/results/clientpositive/mapjoin_mapjoin.q.out
ql/src/test/results/clientpositive/mapjoin_subquery.q.out
ql/src/test/results/clientpositive/mapjoin_subquery2.q.out
ql/src/test/results/clientpositive/multiMapJoin1.q.out
ql/src/test/results/clientpositive/multi_join_union.q.out
To: JIRA, yhuai
> 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
> Components: Query Processor
> Affects Versions: 0.12.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Attachments: HIVE-4927.D11811.1.patch, HIVE-4927.D11811.2.patch,
> HIVE-4927.D11811.3.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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