Yin Huai created HIVE-4927:
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Summary: 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
{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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