[teiid-issues] [JBoss JIRA] (TEIID-4187) Extend support for PI OLEDB Enterprise Queries in OSI PI Translator

[Ramesh Reddy (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253733#comment-13253733 ] 

Ramesh Reddy commented on TEIID-4187:
-------------------------------------

1) Turned OFF capability for "FULL OUTER JOINS", as PI does not support this
2) Turned ON capability for "supportsInlineViews" for allowing the Nested tables.
3) Added following UDF
{code}
       addPushDownFunction(PI, "ParentName", STRING, STRING, INTEGER); //$NON-NLS-1$
        addPushDownFunction(PI, "VarType", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMID", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMName", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMAbbreviation", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMClassName", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMCanonicallD", STRING, STRING); //$NON-NLS-1$
        addPushDownFunction(PI, "UOMConvert", DOUBLE, DOUBLE, STRING, STRING); //$NON-NLS-1$
{code} 

4) During the metadata import converted all the artifacts with "guid" column type to "string" in Teiid, the translator also does the appropriate casting for value handling.
5) Added a "extension-metadata" property called "TVF", that can be used decorate tables and procedures as Table Valued functions, which can be used in lateral joins
6) Added support for push down of LATERAL JOINS, so that a LATERAL JOIN is converted to "CROSS APPLY" or "OUTER APPLY" commands in PI 

> Extend support for PI OLEDB Enterprise Queries in OSI PI Translator
> -------------------------------------------------------------------
>
>                 Key: TEIID-4187
>                 URL: https://issues.jboss.org/browse/TEIID-4187
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Misc. Connectors
>    Affects Versions: 8.13.3
>            Reporter: Al S
>            Assignee: Ramesh Reddy
>            Priority: Minor
>         Attachments: PI-OLEDB-Enterprise-2012-User-Guide.pdf
>
>
> Background - PI OLEDB queries go against the PI Data Archive whereas PI OLEDB Enterprise go against PI AF, which is a metadata layer that sits atop the PI Data Archive. Both sets of queries are now accessible from the PI JDBC adapter. 
> Please add the following enhancements to allow the OSI PI translator to work more effectively with OLEDB Enterprise queries.
> 1) Import table valued functions as Teiid procedures
> 2) Allow the pushdown of nested table joins
> 3) Update the PI translator to use the CROSS APPLY syntax.
> 4) When importing schemas, importer.ImportKeys has to be set to false as otherwise we receive a DuplicateRecord exception since the table value function ft_GetPIPoint appears in more than one place in the AF schemas. Could we please put in a fix/workaround to address this?
> Please refer to the OLEDB Enterprise Guide for query syntax and rules for more detail.



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