Re: Problem in graphical explain

Miha Radej wrote:
> Hi!
>
> I have some tables and playing with a query and graphical explain got me
> to a strange result - a grey line across the entire window; see
> http://mcajvar.prkoritu.net/pgadmin/graphic_explain_db1.png .

There's something wrong here :-)

>
> I then made an exact duplicate copy of the users, database, everything I
> could think of and tried to duplicate the strange display. But the
> problem wouldn't occur in this local copy; see
> http://mcajvar.prkoritu.net/pgadmin/graphic_explain_db2.png .
>
> Does pgAdmin use the output of the explain query in order to construct
> the graphic illustration?

It does.

If so then these may be helpful:
>
> This yields foo graphics:
> Nested Loop (cost=0.00..0.01 rows=1 width=485)
> Join Filter: ("outer".id = "inner".id_eventi)
> -> Seq Scan on eventi t1 (cost=0.00..0.00 rows=1 width=12)
> Filter: ((datum >= '2006-04-12 00:00:00'::timestamp without
> time zone) AND (datum <= '2006-05-12 00:00:00'::timestamp without time
> zone) AND (prikaz = 1::smallint))
> -> Seq Scan on eventi_vsebina t2 (cost=0.00..0.00 rows=1 width=477)
> Filter: (narocilnica = 1::smallint)
>
> This yields a nice illustration:
> Nested Loop (cost=0.00..47.26 rows=1 width=485)
> Join Filter: ("outer".id = "inner".id_eventi)
> -> Seq Scan on eventi t1 (cost=0.00..35.38 rows=1 width=12)
> Filter: ((datum >= '2006-04-12 00:00:00'::timestamp without
> time zone) AND (datum <= '2006-05-12 00:00:00'::timestamp without time
> zone) AND (prikaz = 1::smallint))
> -> Seq Scan on eventi_vsebina t2 (cost=0.00..11.88 rows=1 width=477)
> Filter: (narocilnica = 1::smallint)

Hm, don't see why this clashes, something wrong with cost=0? Will have
to debug this some day.

Regards,
Andreas