[teiid-issues] [JBoss JIRA] Commented: (TEIID-1326) API request: rewrite query/command before it reaches the teiid planner
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https://jira.jboss.org/browse/TEIID-1326?page=com.atlassian.jira.plugin.s...
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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
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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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