prune operators for empty inputs
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Key: HIVE-1586
URL: https://issues.apache.org/jira/browse/HIVE-1586
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Affects Versions: 0.6.0
Reporter: John Sichi
Assignee: John Sichi
Fix For: 0.7.0
Given this:
create view v as
select * from (
select *,'T1' as m from pokes
union all
select *,'T2' as m from pokes2) u;
select * from v
where m='T2';
When we optimize the query, we can prune away all inputs to the union other
than the one which references pokes2.
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