Re: Anyone working on OLAP stuff?

What we really would like to do is get bitmapped indexes integrated into
PostgreSQL so star queries could be done by combining the bitmap
indexes. TODO has:

* Use bitmaps to fetch heap pages in sequential order [performance]
* Use bitmaps to combine existing indexes [performance]

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Clark C. Evans wrote:
> I'm looking around for a Relational OLAP solution based on
> PostgreSQL (and liberally licensed) to contribute to. If there
> is one out there, great, please forward. If not, is there anyone
> interested in joining a new project?
>
> I was thinking of a simple "star schema" with a single fact table
> to start. The fact table would have two sorts of columns, a
> "dimention" column or an "aggregate" column. These columns
> could be marked... perhaps using extra schema information
> on the relname/attname pair. Once this base schema was defined,
> we'd have to define what a "query" looks like, it appears that
> there is an "XML Analysis" which Hyperion and Microsoft use...
> although YAML would be cleaner. Once there is a query format
> (something simple at first) we could then implement a stored
> procedure which returns a result set when passed a query. The
> first implementation of the proceure would work directly against
> the fact table, doing the necessary aggregations. This bootstrap
> would then be given a nice regression test (with base data and
> expected query results).
>
> With this bootstrap in place, we could then focus on various
> query and/or cacheing optimizations. Further, we could then
> extend the scope to handle more than one fact table (multicube)
> which are attached via one or more shared dimentions, allowing
> the user to bounce between cubes. In parallel to this, someone
> could then be working on a user interface; I was thinking Python
> via Webware or mod_python using PIL.
>
> Anyway, please ping if you are working in this direction or would
> like to work in this direction. The result would be liberally
> licensed (BSDish) and ideally put into the "contrib".
>
> Best,
>
> Clark
>
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