Re: PG planning randomly ? - Mailing list pgsql-performance

"Laurent Raufaste" <analogue@glop.org> writes:
> I'm having some issues with this simple query:

> SELECT
>   _comment.*,
>   _article.title AS article_title,
>   _article.reference AS article_reference
> FROM
>   _comment
>   INNER JOIN _article
>     ON _article.id = _comment.parent_id
> WHERE
>   _comment.path <@ '0.1.3557034'
> ORDER BY
>   _comment.date_publishing DESC
> OFFSET 0
> LIMIT 5
> ;

> The varying information here is the ltree path "0.1.3557034"

What PG version is this?

If it's 8.2 or later then increasing the stats target for _comment.path
to 100 or more would likely help.

            regards, tom lane