minimize execution for (sub)queries which are guaranteed to return no results
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Key: HIVE-1392
URL: https://issues.apache.org/jira/browse/HIVE-1392
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Affects Versions: 0.5.0
Reporter: John Sichi
Fix For: 0.6.0
Examples would be a predicate like
WHERE 1=0
or
WHERE ds='2010-01-01'
if the table is partitioned on ds and no partition exists for that date.
Per HIVE-838, we have to be careful with the relational algebra analysis;
operators like union, outer join, and full-table aggregation can cause rows to
be produced even when one of the inputs is guaranteed to be completely filtered
out.
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