distinct term values?

[Ryan McKinley]

Is there an efficient way to know how many distinct terms there are
for a given field name?

I know I can walk through a TermEnum and put them into a hash, but it
would be useful to know beforehand if you are going to get 4 distinct
values or 40,000

I don't need to know what the terms are, just how many.

name:A
name:A
name:B

I want a function like:
 getDistinctTermValues( "name" ) -> 2

Thanks
ryan

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