Re: A caveat of partitioning tables in the document

Fujii Masao <masao(dot)fujii(at)gmail(dot)com> writes:
> On Wed, Aug 22, 2012 at 12:59 AM, Kasahara Tatsuhito
> <kasahara(dot)tatsuhito(at)gmail(dot)com> wrote:
>> The latest document (doc/src/sgml/ddl.sgml) says
>> =======================================
>> 2974 <itemizedlist>
>> 2975 <listitem>
>> 2976 <para>
>> 2977 Constraint exclusion only works when the query's <literal>WHERE</>
>> 2978 clause contains constants. A parameterized query will not be
>> 2979 optimized, since the planner cannot know which partitions the
>> 2980 parameter value might select at run time. For the same reason,
>> 2981 <quote>stable</> functions such as <function>CURRENT_DATE</function>
>> 2982 must be avoided.
>> 2983 </para>
>> 2984 </listitem
>> =======================================
>> but in my understanding, this problem will be solved on 9.2 (with
>> parameterized plans).
>>
>> Or some issues still remain ?

> At least this limitation "A parameterized query will not be optimized,
> since the planner cannot know which partitions the parameter value
> might select at run time." has been solved unless I'm missing something.
> So we should just get rid of that sentence from the document.

Yes, I think we can take that out now. The issue with stable functions
still remains though.

regards, tom lane