[jira] [Updated] (DERBY-4742) Make outer join reordering work for right outer joins

["Mamta A. Satoor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-4742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mamta A. Satoor updated DERBY-4742:
-----------------------------------

    Urgency: Normal
     Labels: derby_triage10_10  (was: )
    
> Make outer join reordering work for right outer joins
> -----------------------------------------------------
>
>                 Key: DERBY-4742
>                 URL: https://issues.apache.org/jira/browse/DERBY-4742
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
>            Reporter: Dag H. Wanvik
>              Labels: derby_triage10_10
>
> Currently, Derby only attempts to reorder (into left deep) left outer join queries. Right outer join queries are commented out, apparently due to implementation difficulties, cf. this comment in HalfOuterJoinNode.LOJ_reorderable.
> // It is much easier to do LOJ reordering if there is no ROJ.
> // However, we ran into some problem downstream when we transform an ROJ
> // into LOJ -- transformOuterJoin() didn't expect ROJ to be transformed
> // into LOJ alread.  So, we skip optimizing ROJ at the moment.

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