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From "Mamta A. Satoor (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-405) SYNONYM should not be allowed in SESSION schema because that can confusion wih temporary tables
Date Thu, 30 Jun 2005 17:47:01 GMT
    [ http://issues.apache.org/jira/browse/DERBY-405?page=comments#action_12314796 ] 

Mamta A. Satoor commented on DERBY-405:
---------------------------------------

I agree with Dan's response but I think we have a bug here with statement caching. If I recall
correctly, I think the goal was to not cache any statements referencing SESSION schema objects
to cover an example scenario like Satheesh's script above. But looks like in the example Satheesh
gave, select * from session.st1 is getting cached and that is why it does not detect that
session.st1 needs to be mapped to temporary table when it is executed the 2nd time in the
example. 

> SYNONYM should not be allowed in SESSION schema because that can confusion wih temporary
tables
> -----------------------------------------------------------------------------------------------
>
>          Key: DERBY-405
>          URL: http://issues.apache.org/jira/browse/DERBY-405
>      Project: Derby
>         Type: Bug
>   Components: SQL
>     Versions: 10.2.0.0
>     Reporter: Mamta A. Satoor
>      Fix For: 10.2.0.0

>
> A user should not be able to create a synonym in SESSION schema eg
> create synonym session.st1 for app.t1;
> select * from session.st1; -- refers to app.t1
> declare global temporary table st1(c11 int, c12 int) on commit preserve rows not logged;
> select * from session.st1; -- refers to app.t1, is that right?
> I think the last select * from session.st1 should goto temporary table st1 since any
references to objects in SESSION schema should first find a match against a temporary table
if one by that name exists. 
> We already discourage users from defining objects other than temporary table in SESSION
schema in the reference manual "Using SESSION as the schema name of a physical table will
not cause an error, but is discouraged. The SESSION schema name should be reserved for the
temporary table schema." But, IMHO, it will be nice to enforce this wherever possible in Derby
code rather than leaving it upto the users to avoid confusion.

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