| From: | Amit kapila <amit(dot)kapila(at)huawei(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "hlinnaka(at)iki(dot)fi" <hlinnaka(at)iki(dot)fi>, "'Kyotaro HORIGUCHI'" <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Identity projection |
| Date: | 2013-02-09 02:49:41 |
| Message-ID: | 6C0B27F7206C9E4CA54AE035729E9C38420CD261@szxeml558-mbs.china.huawei.com |
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| Lists: | pgsql-hackers |
Saturday, February 09, 2013 6:56 AM Amit kapila wrote:
>Friday, February 08, 2013 11:06 PM Tom Lane wrote:
> >Amit Kapila <amit(dot)kapila(at)huawei(dot)com> writes:
>>> On Friday, February 08, 2013 12:00 AM Tom Lane wrote:
>>> As per my understanding, currently in code wherever Result node can be
>>> avoided,
>> Hm. Really there's a whole dance that typically goes on, which is like
>> if (!is_projection_capable_plan(result_plan))
>> ....
>> Perhaps we could encapsulate this whole sequence into a function called
>> say assign_targetlist_to_plan(), which would have the responsibility to
>> decide whether a Result node needs to be inserted.
> if (!is_projection_capable_plan(result_plan) && compare_tlist_exprs(sub_tlist, result_plan->targetlist) )
Sorry, the check I suggested in last mail should be as below:
if (!is_projection_capable_plan(result_plan) && !compare_tlist_exprs(sub_tlist, result_plan->targetlist) )
With Regards,
Amit Kapila.
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