BUG #4812: statistics not available on tables containing only hstore column

The following bug has been logged online:

Bug reference: 4812
Logged by: George Su
Email address: george(dot)su(at)efrontier(dot)com
PostgreSQL version: 8.3.6
Operating system: SUSE Linux
Description: statistics not available on tables containing only
hstore column
Details:

If I create a table containing only hstore columns, then no statistics on
row count and page count is available even after analyzing.

safire:9945:postgres# create table tmp_tbl (a hstore);
CREATE TABLE
safire:9945:postgres# insert into tmp_tbl select i::text => i::text from
generate_series(1, 100000) as i;
INSERT 0 100000
safire:9945:postgres# analyze tmp_tbl;
ANALYZE
safire:9945:postgres# select count(*) from tmp_tbl;
count
--------
100000
(1 row)

safire:9945:postgres# select relname, relpages, reltuples from pg_class
where relname = 'tmp_tbl';
relname | relpages | reltuples
---------+----------+-----------
tmp_tbl | 0 | 0
(1 row)

The statistics shows up if I add a, for example, int column.