[postgis-devel] Re: [Bizgres-general] Bizgres MPP and PostGIS
schabi at logix-tt.com
Mon Sep 25 10:11:28 PDT 2006
Luke Lonergan wrote:
>> However, to be parallelizable, at least aggregates will need special
>> support, to merge the distributed states, I presume.
> As of recently, we allow user defined aggregates per the PostgreSQL spec.
> These can be parallel - which is critical for large data. We routinely use
> 64+ CPUs to compute aggregates, which allows us to scale to tens of TB.
How do you merge the distributed states? Does the user have to define a
special merge function?
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS
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