[teiid-issues] [JBoss JIRA] Commented: (TEIID-1326) API request: rewrite query/command before it reaches the teiid planner
Mark Addleman (JIRA)
jira-events at lists.jboss.org
Wed Oct 27 15:04:55 EDT 2010
[ https://jira.jboss.org/browse/TEIID-1326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559776#action_12559776 ]
Mark Addleman commented on TEIID-1326:
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Our primary use case is for view definitions although I imagine altering the SQL based on user/role. Here are two use cases:
1) We have a dynamic set of datasources that we access through Teiid. As the list of data sources changes, the list of UNIONed SELECTs would change.
2) To provide row-level security, we would re-write the query to include appopriate WHERE clause and/or joins based on the user's user id and/or role.
> API request: rewrite query/command before it reaches the teiid planner
> -----------------------------------------------------------------------
>
> 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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