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

Wed Oct 27 14:38:54 EDT 2010

API request:  rewrite query/command before it reaches the teiid planner
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                 Key: TEIID-1326
                 URL: https://jira.jboss.org/browse/TEIID-1326
             Project: Teiid
          Issue Type: Feature Request
          Components: Query Engine
    Affects Versions: 7.1
            Reporter: Mark Addleman
            Assignee: Steven Hawkins

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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