On Wed, Nov 30, 2016 at 12:15 PM, David G. Johnston
<david.g.johnston@gmail.com> wrote:
> On Wed, Nov 30, 2016 at 8:15 AM, btober@computer.org
> <btober@broadstripe.net> wrote:
>>
>> 5. Use a CTE:
>>
>> with shortnames as (
>> select to_char(impressions_create_date,'yyyy-mm-dd') as ymd from
>> impressionsdb
>> ) select ymd from shortnames where ymd like '2016-11%';
>>
>
> Except that WHERE clause won't get pushed down (I think...haven't checked an
> explain recently) so a sub-select is definitely better in this scenario.
It's still the case FWICT. I suspect CTE optimization fencing is
mostly considered a feature, not a bug.
merlin
