[jira] Commented: (DERBY-573) Provide support for optimizer overrides in Derby.

["Satheesh Bandaram (JIRA)" <de...@db.apache.org>]

    [ http://issues.apache.org/jira/browse/DERBY-573?page=comments#action_12360326 ] 

Satheesh Bandaram commented on DERBY-573:
-----------------------------------------

This patch has been committed to trunk.

Transmitting file data ........................................
Committed revision 356562.

It seems you have also resolved DERBY-727 along with this change, so please mark both of them as RESOLVED and close them after testing on trunk build. You figured out several hard issues here 1) Ability to extract hints provided in comments 2) Soft upgrade issues and 3) adding upgrade infrastructure for 10.2. Good job!


> Provide support for optimizer overrides in Derby.
> -------------------------------------------------
>
>          Key: DERBY-573
>          URL: http://issues.apache.org/jira/browse/DERBY-573
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Versions: 10.2.0.0
>     Reporter: Mamta A. Satoor
>     Assignee: Mamta A. Satoor
>  Attachments: derby572OptimizerOverridesAndUpgrade120605.txt, derby572OptimizerOverridesAndUpgrade121105.txt, derby572OptimizerOverridesAndUpgrade121205.txt, derby573OptimierOverrides110805.txt, optimizeroverrides.html, optimizeroverrides.html
>
> Derby's query optimizer usually makes the best choice of join order and access path. The default join strategy ususally works the best too. However, there are some cases in which user may want to override the optimizer or the default values. Providing support for optimizer overrides will allow users to hand-tune the optimizer for queries. 

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