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https://issues.apache.org/jira/browse/DERBY-4742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dag H. Wanvik updated DERBY-4742:
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Affects Version/s: 10.5.3.0
10.5.2.0
10.5.1.1
10.4.2.0
10.4.1.3
10.3.3.0
10.3.2.1
10.3.1.4
10.2.2.0
10.2.1.6
10.1.3.1
10.1.2.1
10.1.1.0
10.0.2.1
10.0.2.0
> 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
>
> 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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