Recently I had to calculate the relative dimension of a polygon relative to the others of the same class. I know there are a lot of way to do it, inside and outside QGIS, but I wondered if field calculator (and expressions in general) couls be extended to accompish this kind of tasks.
The approach would be something similar WINDOW functions in Postgresql [1], where for each record a new value will be calculated on the basis of other records (filtered or not). Has this ever been discussed? Is it something that could fit QGIS expressions? giovanni [1] http://www.postgresql.org/docs/9.1/static/tutorial-window.html -- Giovanni Allegri http://about.me/giovanniallegri Twitter: https://twitter.com/_giohappy_ blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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