index full scan over an index fast full scan in an analytic function?

From: <rgaffuri_at_cox.net>
Date: Thu, 23 Oct 2003 11:09:26 -0800
Message-ID: <F001.005D41EE.20031023110926@fatcity.com>

I have an index on the two columns used in this query. Why would the optimizer choose an index full scan over an index fast full scan?

My question isnt why an index is used, but the type of index scan?

select *

    from (select col1, col2,

          dense_rank()
          over (partition by col1
                order by col2 desc)tab
          from mytable)

   where tab = 1

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Author: <rgaffuri_at_cox.net
  INET: rgaffuri_at_cox.net

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