Re: partitionning

On Sat, Mar 12, 2005 at 08:24:20PM +0000, Mike Rylander wrote:
> There is now way to have PG completely skip the unused partitions.
> However, with an index on the "partitioner" column of each partition
> table PG will basically fall of the end of the index almost
> imediately, and then use an appropiate plan for the useful partitions.
> It's not the same as Oracle partitioning, but without expicit Planner
> work it can't be.

Note, the planner does have most of the intelligence needed to
determine when it can skip a partition. It has code that can determine
if the intersection of:

Partition constraint: lower bound < value < upper bound
Query clause: value [operator] constant

Will be always false or can be true. It's just a matter of getting the
clause to the right place to make it skip...

Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.