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From prasenjit mukherjee <prasen....@gmail.com>
Subject Re: Lucene Challenge - sum, count, avg, etc.
Date Thu, 01 Apr 2010 01:23:49 GMT
I too am trying to achieve something.

I am thinking of storing the integer values in  payloads and then
using spanquery classes to compute the respective SUMs

-Prasen

On Thu, Apr 1, 2010 at 6:47 AM, Michel Nadeau <akaris@gmail.com> wrote:
> Hi,
>
> We're currently in the process of switching many of our screens from MySQL
> to Lucene because MySQL simply dies because we have too much data and it's
> becoming too long to generate the stats we need.
>
> So here's one MySQL query that we use to find out our Top 10 Affiliates :
>
> SELECT SUM(sale_amount) AS total_sales, affialiate_id FROM sales WHERE
> sale_date>='2010-03-01' AND sale_date<='2010-03-31' GROUP BY affialiate_id
> ORDER BY total_sales DESC LIMIT 10;
>
> We currently have our "sales" index, containing all sales and all fields -
> and it's one big index (over 10M records). We could fetch all documents
> within the date range, loop them and add up the total_sales, but it would be
> just crazy to do this all the time (we have a high volume of search).
>
> We made several tests with Solr (Facets, and even the beta CollapseFields),
> but nothing is really helping us. We could pre-generate the total_sales for
> all possible date ranges... but that would be quite crazy too as the date
> range possibilities quickly become endless.
>
> So - is there any known way to efficiently do SUM(), COUNT() (and even AVG()
> ) using Lucene/Solr/others? I also checked Bobo Browse but it doesn't seem
> to offer what I need either.
>
> Thanks for any hints!!!
>
> - Mike
> akaris@gmail.com
>

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