Re: Extension of Thick Indexes

Hi All,

We are extending Gokul's Thick index functionality. 
I am attaching design doc and patch here with it. 

Thick index improvements 
1. Fix existing defects
2. Extend thick index usage for group by, count, nested queries, and
"delete/update with join" queries.
3. Improve cost estimates

Pending Features 
1. Expression based thick index.
2. Support for Or conditions.
3. Optimization for update/delete queries. 

Details can be found in design doc. We are using anoncvs checkout dated 1
dec 08. Please take a look at it.

Thanks, 
Shrish Purohit | Software Engineer | Persistent Systems
shrish_purohit@persistent.co.in  | Cell: +91 98509 59940 | Tel: +91 (20)
3023 4493
Innovation in software product design, development and delivery-
www.persistentsys.com

-----Original Message-----
From: Amit Gupta [mailto:amit.pc.gupta@gmail.com] 
Sent: Friday, February 06, 2009 3:47 PM
To: pgsql-hackers@postgresql.org
Cc: gokul007@gmail.com
Subject: Re: Extension of Thick Indexes

We are plainning to use the attached result for estimating cost of
scanning thick indexes.

Regards,
Amit
Persistent Systemswww.persistentsys.com

On 1/22/09, Amit Gupta <amit.pc.gupta@gmail.com> wrote:
> Hi,
>
>  We are extending Gokul's Thick index functionality
> (http://archives.postgresql.org/pgsql-patches/2008-01/msg00092.php)
> on 8.4 code base to
>  - fix existing defects
>  - Extend thick index usage for group by, count, nested queries, and
> "delete/update with join" queries.
>  - Improve cost estimates for using thick indexes, and
>  - Support OR condition queries using thick indexes (which involves
> computation of bitmap-or)
>
>  Details of the above features can be seen at
> http://aurora.regenstrief.org/postgresql/report/6
>
>  Please let me know if you have any comments or suggestions.
>
>  Thanks,
>  Amit
>  Persistent Systems
>
>

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