[teiid-issues] [JBoss JIRA] (TEIID-2251) All multi-source models share the same metadata

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2251.
-----------------------------------
    Resolution: Deferred


Without a major overhaul of the import logic especially when sources are added/removed at runtime, there isn't a great way to do this.  If manipulating the import naming is not sufficient (such as errors caused by native type) another workaround is to use a vdb per source and then a multi-source vdb over the source vdbs.

> All multi-source models share the same metadata
> -----------------------------------------------
>
>                 Key: TEIID-2251
>                 URL: https://issues.jboss.org/browse/TEIID-2251
>             Project: Teiid
>          Issue Type: Sub-task
>          Components: Query Engine, Server
>    Affects Versions: 8.1, 8.2
>         Environment: Win XP pro, JBoss AS 7.1.1, JDBC drivers: system-i (jt400 7.8) , MySQL (connector/j 6.5.1)
>            Reporter: Dave Stannard
>            Assignee: Steven Hawkins
>
> Sharing the same metadata can cause issues, for heterogeneous sources or when attempting to use multi-source for multiple schemas, as described below:
> Teiid issues queries with the catalog and schema of the the primary source.  This gives invalid results for all the other sources.
> If the non-primary source connection(s) have authority to access the primary's catalog/schema then duplicated rows are returned to the client.
> If it does *not* have authority then an error results.
> Note: In MySQL this effect can be mitigated by setting useCatalogName=false.  This seems to be because the JDBC4DatabaseMetaData.getTables() method does not return a schema; so suppressing the catalog is enough.
> For the System-I whose equivalent getTables() method returns a catalog and schema, I couldn't find a workaround.



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