Re: Pushing IN (subquery) down through UNION ALL?

On Thu, Feb 24, 2011 at 12:59 PM, Vik Reykja <vikreykja(at)gmail(dot)com> wrote:

> On Thu, Feb 24, 2011 at 20:56, Dave Johansen <davejohansen(at)gmail(dot)com>wrote:
>
>> On Thu, Feb 24, 2011 at 12:33 PM, Vik Reykja <vikreykja(at)gmail(dot)com> wrote:
>>
>>> On Thu, Feb 24, 2011 at 16:14, Dave Johansen <davejohansen(at)gmail(dot)com>wrote:
>>>
>>>> You'll notice that the subquery version is doing the full join and then
>>>> the filtering, but the explicitly listed version pushing the filtering into
>>>> the plan before the join. Is there a way to make the subquery version
>>>> perform the same optimization?
>>>>
>>>
>>> EXPLAIN ANALYZE SELECT * FROM addressesall WHERE id = ANY (array(SELECT
>>> id FROM users WHERE name='A'));
>>>
>>> (Tested on 9.0.3)
>>>
>>
>> I just tested that on 8.3.3 and it performed quickly like I expected the
>> other query to, so that did the trick.
>>
>
> Is there any good reason you're not using 8.3.14?
>

No, I just haven't taken the time to do the upgrade on all of our systems.
It is definitely something that I have started to consider more strongly
though.

Dave