subselects doesn't work in v7.0.3

jose (jose(at)sferacarta(dot)com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
subselects doesn't work in v7.0.3

Long Description
Version: PostgreSQL 7.0.3 on i686-pc-linux-gnu, compiled by gcc 2.95.2

- I'm trying the following query in a table with 1973093 rows:

EXPLAIN select count(*)
from marche
where ristampa = 'S'
and marca in
(
select marca from marche where ristampa is null and
data_lotto between '1998/07/01' and '1999/01/31'
);

NOTICE: QUERY PLAN:
Aggregate (cost=98854229180.08..98854229180.08 rows=1 width=4)
-> Seq Scan on marche (cost=0.00..98854229130.75 rows=19731 width=4)
SubPlan
-> Materialize (cost=50101.13..50101.13 rows=6577 width=12)
-> Seq Scan on marche (cost=0.00..50101.13 rows=6577 width=12)
EXPLAIN

- but it takes to many time: (after about 16 hours I interrupt the query)

verde:/var/lib/postgreSQL$ time psql interno < ./sql

Cancel request sent
ERROR: Query was cancelled.
ERROR: Query was cancelled.

real 954m44.582s
user 0m0.020s
sys 0m0.000s

- I tried the same query on DBMaker and it takes only about 1 minute.

dmSQL>
USE db #1 disconnected from db:<interno> by user:<sysadm>

real 1m10.070s
user 0m0.020s
sys 0m0.020s

- I tried the same query in a table with few rows and it
seems to work.

Sample Code

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