[jira] [Commented] (DERBY-6117) Extend the Table Functions java interface to pass more query context information from Derby

["Rick Hillegas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-6117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13882474#comment-13882474 ] 

Rick Hillegas commented on DERBY-6117:
--------------------------------------

Note that part of item (3) can be obtained by calling DriverManager.getConnection( "jdbc:default:connection" ) in order to get the connection and then executing a "values current_user" statement.

> 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
>              Labels: derby_triage10_11
>
> 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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