[teiid-issues] [JBoss JIRA] Commented: (TEIID-1326) API request: rewrite query/command before it reaches the teiid planner

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-1326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574176#comment-12574176 ] 

Steven Hawkins commented on TEIID-1326:
---------------------------------------

Here again would you want the connection to be present?

> API request:  rewrite query/command before it reaches the teiid planner
> -----------------------------------------------------------------------
>
>                 Key: TEIID-1326
>                 URL: https://issues.jboss.org/browse/TEIID-1326
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>    Affects Versions: 7.1
>            Reporter: Mark Addleman
>            Assignee: Steven Hawkins
>             Fix For: 7.3
>
>
> I'd like an API to inspect and rewrite a user query/command before it reaches the Teiid planner. The use case is to rewrite the query/command to implement view-like capabilities.  For example:
> SELECT a,b,c FROM table1 AS t WHERE t.a='xyz'  would be rewritten as:
> SELECT a,b,c FROM (SELECT a,b,c FROM table2 UNION SELECT a,b,c FROM table3) AS t
> I imagine this API would be similar to the translator API:  it would receive a data structure representing the query/command and use a visitor to rewrite the query.  As a convenience, it would be nice to have something similar to the SQLConversionVisitor.

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