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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3886) SQL roles: show enabled roles
Date Mon, 29 Sep 2008 13:36:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635380#action_12635380
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Rick Hillegas commented on DERBY-3886:
--------------------------------------

Hey Dag, this is pretty slick. Some small questions:

1) Does the VTI need to implement VTICosting? I think that getEstimatedCostPerInstantiation()
is probably returning a number that isn't tuned to any particular machine. I don't think that
the optimizer has a lot of choice here and it doesn't seem to me that the VTICosting implementation
will help the optimizer pick a better plan.

2) Will the closure iterator return the roles in some reasonable sort order? For someone just
selecting from the VTI it wouldn't matter because they could just slap an ORDER BY on the
SELECT. But once the SELECT is hidden inside a system procedure, the user can't inject an
ORDER BY clause.

These are just nits. Looks like a great approach.

> SQL roles: show enabled roles
> -----------------------------
>
>                 Key: DERBY-3886
>                 URL: https://issues.apache.org/jira/browse/DERBY-3886
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL, Tools
>            Reporter: Dag H. Wanvik
>         Attachments: enabled-roles.diff, enabled-roles.stat
>
>
> Rick suggested it would be nice to have something to allow inspection of enabled roles,
cf the 
> ENABLED_ROLES view of the information schema, SQL 2003, vol 11, section 5.29.
> I enclose patch suggestion for doing this via a new VTI table and syntactic sugar in
ij:
> SYSCS_DIAG.ENABLED_ROLES and and ij command "show enabled_roles".
> Not for commit at this point, we may want to handle to general question of information
schemata
> in another way. What say thee?

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