[teiid-issues] [JBoss JIRA] (TEIID-2190) Key usage can remove predicates

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-2190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2190.
-----------------------------------

    Resolution: Done


Corrected the RuleImplementJoinStrategy logic and accounted for dependent joins, which did not interact well with this optimization, since the dependent predicates are created prior to this rule.
                
> Key usage can remove predicates
> -------------------------------
>
>                 Key: TEIID-2190
>                 URL: https://issues.jboss.org/browse/TEIID-2190
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>    Affects Versions: 7.4
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>            Priority: Blocker
>             Fix For: 8.2
>
>
> The implementation strategy for predicate realignment can drop non-column equi join predicates and predicates involving the same column reused multiple times.
> i.e. 
> create local temporary table x (e1 string, e2 integer, primary key (e1));
> create local temporary table x1 (e1 string, e2 integer)
> ...
> select x.e1 from x inner join x1 on x.e1 = x1.e1 and upper(x.e1) = x1.e2
> May end up not applying the upper predicate.

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