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https://issues.apache.org/jira/browse/PIG-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai updated PIG-1322:
----------------------------
Assignee: Xuefu Zhang (was: Daniel Dai)
Fix Version/s: 0.9.0
> Logical Optimizer: change outer join into regular join
> ------------------------------------------------------
>
> Key: PIG-1322
> URL: https://issues.apache.org/jira/browse/PIG-1322
> Project: Pig
> Issue Type: Sub-task
> Components: impl
> Affects Versions: 0.7.0
> Reporter: Daniel Dai
> Assignee: Xuefu Zhang
> Fix For: 0.9.0
>
>
> In some cases, we can change the outer join into a regular join. The benefit
> is regular join is easier to optimize in subsequent optimization.
> Example:
> C = join A by a0 LEFT OUTER, B by b0;
> D = filter C by b0 > 0;
> =>
> C = join A by a0, B by b0;
> D = filter C by b0 > 0;
> Because we made this change, so PushUpFilter rule can further push the filter
> in front of regular join which otherwise cannot.
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