Re: [teiid-designer-dev] [teiid-dev] query plan changes
Steven Hawkins wrote:
Hello all,
Currently we have OPTION SHOWPLAN PLANONLY DEBUG to control planning and execution. The
drawbacks are that this introduces three reserved words (SHOWPLAN, PLANONLY, DEBUG) and
it's only applicable to the top level user query.
The proposed replacement makes use of https://jira.jboss.org/jira/browse/TEIID-906, which
added basic support for a set statement:
SET SHOWPLAN [ON|DEBUG|OFF]
SET NOEXEC [ON|OFF] - general replacement for PLANONLY, will not execute the command if
ON
This seems a reasonable way to reduce the keywords and allow repetitive
executions without having to modify the query syntax each time. How are
these commands scoped, per session? It would be cool if these could be
used to enable plan output for a query coming from an application where
the user cannot easily change the query itself. Presumably defaults
would be SHOWPLAN=OFF and NOEXEC=OFF.
Given that EXEC is a reserved word for executing a procedure, do you
think NOEXEC might cause confusion (users thinking it's the negative
form of EXEC)?
I would also like to remove most of the logic surrounding the
org.teiid.client.plan.PlanNode class. The visitors, display helpers, etc. Since we
don't publish a meaningful schema for the xml form(s) or document the property keys we
might as well assume that we're the primary consumers and forgo the flexibility.
Don't know about this one. Hard to foresee how users might consume the
query plan XML in the future.
Any thoughts?
Steve
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Ken Johnson
Sr. Product Manager
JBoss Middleware Business Unit
Red Hat, Inc
978.392.3917
ken.johnson(a)redhat.com