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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-6117) Extend the Table Functions java interface to pass more query context information from Derby
Date Mon, 27 Jan 2014 01:23:37 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-6117:

    Attachment: derby-6117-01-ab-AwareVTI.diff

Attaching derby-6117-01-ab-AwareVTI.diff. This fixes an NPE during compilation of old-style
VTIs, introduced by the previous rev of the patch. Re-starting the tests.

Touches the same files as the previous rev.

> Extend the Table Functions java interface to pass more query context information from
> -------------------------------------------------------------------------------------------
>                 Key: DERBY-6117
>                 URL: https://issues.apache.org/jira/browse/DERBY-6117
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions:
>            Reporter: David Vyvyan
>              Labels: derby_triage10_11
>         Attachments: derby-6117-01-aa-AwareVTI.diff, derby-6117-01-ab-AwareVTI.diff
> 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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