Re: select max(column) from parent table very slow

"Joshua D. Drake" <jd@commandprompt.com> writes:
> Sriram Dandapani wrote:
>> Parent table has a column say column1 which is indexed (parent table and
>> all child tables are indexed on that column)

> In older versions of postgresql that would scan the whole table. In 8.1
> and above it doesn't. However, I am guess that since this is a
> partitioned table the planner isn't smart enough to just perform the
> query on each child and a max on the set that is returned.

It is not.  Feel free to submit a patch for planagg.c ...

            regards, tom lane