Re: FailedAssertion() in 8.2beta1

On Sat, 7 Oct 2006, Tom Lane wrote:

> "Sergey E. Koposov" <math(at)sai(dot)msu(dot)ru> writes:
>> I've found a bug with 8.2beta1:
>
> Can you put together a self-contained test case for this? The planner

I'll try, but it will be quite hard.

> is evidently generating an incorrect plan from that messy view, but
> trying to reverse-engineer the complete scenario from what you've told
> us looks painful. (No, I don't think the log setting is related.)
>

At least the plan for the problematic query looks like this

cas=# explain UPDATE table_list SET description = 'tag{image SRC="/vizier/new2.gif"}3rd release of DENIS (2005Sep)' WHERE id = cas_get_table_id ('cas_data_sega','b_denis_denis5' );
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------------
Nested Loop (cost=0.01..17.11 rows=2 width=82)
-> Index Scan using table_user_list_pkey on table_user_list (cost=0.00..8.02 rows=1 width=10)
Index Cond: (cas_get_table_id('cas_data_sega'::character varying, 'b_denis_denis5'::character varying) = id)
-> Append (cost=0.00..9.07 rows=2 width=76)
-> Index Scan using table_user_list_pkey on table_user_list (cost=0.00..8.02 rows=1 width=76)
Index Cond: (id = cas_get_table_id('cas_data_sega'::character varying, 'b_denis_denis5'::character varying))
-> Seq Scan on table_list (cost=0.00..1.04 rows=1 width=51)
Filter: (id = cas_get_table_id('cas_data_sega'::character varying, 'b_denis_denis5'::character varying))
(8 rows)

As I see from it, it generates two seq. scans for one table (table_user_list)

Will it be enough to provide the testcase for just that 'expain UPDATE' ?

Regards,
Sergey

*******************************************************************
Sergey E. Koposov
Max Planck Institute for Astronomy/Sternberg Astronomical Institute
Tel: +49-6221-528-349
Web: http://lnfm1.sai.msu.ru/~math
E-mail: math(at)sai(dot)msu(dot)ru