[jira] [Updated] (TAJO-853) Refactoring FilterPushDown for OUTER JOIN

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyunsik Choi updated TAJO-853:
------------------------------

    Priority: Critical  (was: Minor)

> Refactoring FilterPushDown for OUTER JOIN
> -----------------------------------------
>
>                 Key: TAJO-853
>                 URL: https://issues.apache.org/jira/browse/TAJO-853
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: Hyoungjun Kim
>            Assignee: Hyoungjun Kim
>            Priority: Critical
>
> Currently Tajo doesn't support a filter OUTER JOIN's ON clause.
> or has some bugs. There is some rules for this in the following urls.
> - http://www.ibm.com/developerworks/data/library/techarticle/purcell/0112purcell.html
> - https://cwiki.apache.org/confluence/display/Hive/OuterJoinBehavior
> Briefly summarized as follows.
> - Join Predicate on Preserved Row Table: Used for join condition(not filter)
> - Join Predicate on Null Supplying Table: Can push down to the table scan
> - Where Predicate on Preserved Row Table: Can push down to the table scan
> - Where Predicate on Null Supplying Table: Used for filter with join result data. This filter condition is attached to SELECTION Node.



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