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From "David Vyvyan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-6117) Extend the Table Functions java interface to pass more query context information from Derby
Date Thu, 21 Mar 2013 15:37:16 GMT
David Vyvyan created DERBY-6117:
-----------------------------------

             Summary: Extend the Table Functions java interface to pass more query context
information from Derby
                 Key: DERBY-6117
                 URL: https://issues.apache.org/jira/browse/DERBY-6117
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.8.3.0
            Reporter: David Vyvyan


General requirement is to extend the Table Functions java interface (through RestrictedVTI
or another interface) and pass more context information from Derby to Table Functions - esp
in query execution phase.

Greater urgency is required for the first 2 items below, especially the ability to access
the original SQL which was available with VTIs. This is critical to the GaianDB project -
we extract HINTs from the query (where we pass meta data like user credentials), and also
extract full original complex predicate expressions (involving functions etc - which cannot
be expressed with a Restriction) - to push on in our query prorogation...

In order of importance + simplicity:
--------------------------------------------------
1 - Original SQL (this used to be available with VTIs through VTIEnvironment for both compilation
and execution phases)
2 - Name of function that was called

3 - User Info (ID, etc) - (this can currently be passed in the SQL hint)
4 - Richer predicate expressions (incl functions, etc)
5 - Context within Join query (e.g. inner or outer table, join type)
6 - Other Query Plan information
7 - Anything else...?


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