limit does not work if applied to outer most block and it is not a query
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Key: HIVE-75
URL: https://issues.apache.org/jira/browse/HIVE-75
Project: Hadoop Hive
Issue Type: Bug
Reporter: Namit Jain
Assignee: Namit Jain
limit does not work if applied to outer most block and it is not a query
For eg
insert into T1 select ... from T2 limit 10;
will be executed as a map-job only.
which means that the total number of rows in T1 is bounded by 10 * number of
mappers.
We need another map-reduce job to fix this or the move task needs to be
modified.
For now, the simpler fix of another map-reduce job should be ok, in future we
can further optimize it by modifying the move task
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