Is it possible to use float and date ranges in that case? Or maybe I should just read the details in the manual and stop asking stupid questions. :-)
There is no such thing as a stupid question ;-)
At the end of the day, Lucene just handles strings; and it handles them lexocographically. The DateField class turns a Date into a string that sorts well. (DateField doesn't handle all values of a 'long', though).
For float, you may have to pick some range of floats that you will allow, and use a java.util.DecimalFormat to format them to a fixed-width, zero-padded string. If you are going to allow -ve values, then it gets trickier (I have the trick if you need to know this).
=Matt
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