Oh, now problem with simple query:
8.4.0 from Debian
explain analyze select i from t where i >= 10 and i = 1;
QUERY PLAN
------------------------------------------------------------------------------------
Result (cost=0.00..0.01 rows=1 width=0) (actual time=0.002..0.002 rows=0 loops=1)
One-Time Filter: false
Total runtime: 0.030 ms
CVS HEAD
explain analyze select i from t where i >= 10 and i = 1;
QUERY PLAN
---------------------------------------------------------------------------------------------------
Seq Scan on t (cost=0.00..17030.00 rows=1 width=4) (actual time=449.651..449.651 rows=0 loops=1)
Filter: ((i >= 10) AND (i = 1))
Total runtime: 449.726 ms
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Sergey Burladyan