clustering by partial indexes

This might have been discussed before but I wanted to know if clustering tables
by partial indexes will be availble in a later release of pgSQL?

For the record, this is the error I get in 8.1:

iprism=# cluster hrs_idx on report;
ERROR: cannot cluster on partial index "hrs_idx"

hrs_idx is defined as:

iprism=# \d hrs_idx
Index "public.hrs_idx"
Column | Type
--------+--------------------------
stamp | timestamp with time zone
btree, for table "public.report", predicate (thehour(stamp) >= 0::double
precision AND thehour(stamp) <= 23::double precision)

--
Keith C. Perry, MS E.E.
Director of Networks & Applications
VCSN, Inc.
http://vcsn.com

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