postgresql bug?
i am using version 8.0.3
if you run the following query:
select count(*) from T1 where (T1.a>10 and T1.a<20) or (T1.a>90 and T1.a
<100)
the set_baserel_size_estimate will accurately estimate the selectivity on
T1.
However, if you run
select count(*) from T1, T2 where T1.b=T2.c and (T1.a>10 and T1.a<20) or (
T1.a>90 and T1.a<100)
the selectivity estimate on T1 is always 1.0 the reason is the
re-l->baserestrictinfo is NULL for the second query in
set_baserel_size_estimates().
is this a bug?
uwcssa <uwcssa@gmail.com> writes:
select count(*) from T1, T2 where T1.b=3DT2.c and (T1.a>10 and T1.a<20) or=
(
T1.a>90 and T1.a<100)
the selectivity estimate on T1 is always 1.0 the reason is the
re-l->baserestrictinfo is NULL for the second query in
set_baserel_size_estimates().
Sure you're not looking at T2?
regards, tom lane