Re: planinstr, showing planner time on EXPLAIN

On Tue, Jun 14, 2011 at 11:18 PM, Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com> wrote:
> Yesterday on PGXN I just released the first version of planinstr, a
> plugin module to append planner time to EXPLAIN. I post this here
> since it is mostly for developers.
>
> http://www.pgxn.org/dist/planinstr/
>
> db1=# load '$libdir/planinstr';
> LOAD
> db1=# explain select * from pg_class;
>                          QUERY PLAN
> ---------------------------------------------------------------
>  Seq Scan on pg_class  (cost=0.00..141.87 rows=3287 width=194)
>  Plan time: 0.119 ms
>
> db1=# explain analyze select count(*) from size_m;
>                                                       QUERY PLAN
>
> ------------------------------------------------------------------------------------------------------------------------
>  Aggregate  (cost=26272.00..26272.01 rows=1 width=0) (actual
> time=51.938..51.938 rows=1 loops=1)
>   ->  Append  (cost=0.00..23147.00 rows=1250000 width=0) (actual
> time=0.037..45.809 rows=20000 loops=1)
>         ->  Seq Scan on size_m  (cost=0.00..847.00 rows=20000
> width=0) (actual time=0.037..41.863 rows=20000 loops=1)
> <.. snip ..>
>         ->  Seq Scan on myt1000 size_m  (cost=0.00..22.30 rows=1230
> width=0) (actual time=0.001..0.001 rows=0 loops=1)
>  Total runtime: 75.217 ms
>  Plan time: 61.353 ms
> (1005 rows)

Wow, that is awesome. I sorta wish we had something like that in core
-- and I don't even think it should be optional, I think it should
just always give you that additional piece of information.

I can't immediately count the number of times this would have helped
me, but it's significant.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company