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I didn't, my vendor's developers did.

It was a data visualization tool which let users make dashboards based on your data-warehouse. You could add filters to let users "slice-and-dice" the data in the dashboard.

Needless to say one of the measures had a large number of parameters. The dashboard in question allowed users to see the change in measurements of [X] over time where [X] was one of 50k poisons that the Environment Agency were measuring.

It a pretty reasonable question and - in browsers with O(n) hash lookup in their hashmaps - performed excellently.




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