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https://issues.apache.org/jira/browse/HIVE-218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joydeep Sen Sarma reassigned HIVE-218:
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Assignee: Prasad Chakka
Ashish said this would be resolved by predicate pushdown
> predicate on partitioning column is ignored in many places
> ----------------------------------------------------------
>
> Key: HIVE-218
> URL: https://issues.apache.org/jira/browse/HIVE-218
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Joydeep Sen Sarma
> Assignee: Prasad Chakka
> Priority: Blocker
>
> We tried two queries yesterday that bought up several problems:
> 1. predicate on partitioning column within a join clause was ignored:
> FROM (FROM xxx a SELECT a.xx, a.yy, a.ds WHERE a.ds=2009-01-05 UNION ALL FROM
> yyy SELECT b.xx, b.yy, b.ds WHERE b.ds=2009-01-05 UNION ALL FROM zzz c SELECT
> c.xx, c.yy, c.ds WHERE c.ds=2009-01-05) d JOIN aaa e ON (d.xx=e.xx AND
> e.ds=2009-01-05) INSERT OVERWRITE TABLE ...
> the plan tried to scan *all* partitions!
> 2. predicate on partitioning clause inside insert clause was ignored (we took
> the previous query and moved the partition filter to the insert statement)
> FROM (FROM xxx a SELECT a.xx, a.yy, a.ds WHERE a.ds=2009-01-05 UNION ALL FROM
> yyy SELECT b.xx, b.yy, b.ds WHERE b.ds=2009-01-05 UNION ALL FROM zzz c SELECT
> c.xx, c.yy, c.ds WHERE c.ds=2009-01-05) d JOIN aaa e ON (d.xx=e.xx ) INSERT
> OVERWRITE TABLE ... WHERE e.ds=2009-01-05;
> the plan again tried to scan *all* partitions
> the really bad thing is that we were able to detect this problem only because
> of metastore inconsistencies - otherwise - we would have merrily scanned all
> the data. This is really critical to get fixed - because this means that we
> may actually be scanning tons of unnecessary data in production.
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