From: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
---|---|
To: | Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com> |
Cc: | Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: map_partition_varattnos() and whole-row vars |
Date: | 2017-08-03 05:30:06 |
Message-ID: | 3b0b69b4-74d5-d303-32fb-4fc72e1aee90@lab.ntt.co.jp |
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Lists: | pgsql-hackers |
Thanks for the review.
On 2017/08/03 13:54, Amit Khandekar wrote:
> On 2 August 2017 at 11:51, Amit Langote wrote:
>> On 2017/08/02 1:33, Amit Khandekar wrote:
>>> Instead of callers of map_partition_varattnos() reporting error, we
>>> can have map_partition_varattnos() itself report error. Instead of the
>>> found_whole_row parameter of map_partition_varattnos(), we can have
>>> error_on_whole_row parameter. So callers who don't expect whole row,
>>> would pass error_on_whole_row=true to map_partition_varattnos(). This
>>> will simplify the resultant code a bit.
>>
>> So, I think it's only the callers of
>> map_partition_varattnos() who know whether finding whole-row vars is an
>> error and *what kind* of error.
>
> Ok. Got it. Thanks for the explanation.
>
> How about making found_whole_row as an optional parameter ?
> map_partition_varattnos() would populate it only if its not NULL. This
> way, callers who don't bother about whether it is found or not don't
> have to declare a variable and pass its address. In current code,
> ExecInitModifyTable() is the one who has to declare found_whole_row
> without needing it.
Sure, done. But while implementing that, I avoided changing anything in
map_variable_attnos(), such as adding a check for not-NULLness of
found_whole_row. The only check added is in map_partition_varattnos().
Attached updated patches.
Thanks,
Amit
Attachment | Content-Type | Size |
---|---|---|
0001-Fix-map_partition_varattnos-to-not-error-on-found_wh-v2.patch | text/plain | 9.3 KB |
0002-Teach-map_variable_attnos_mutator-to-convert-whole-r-v2.patch | text/plain | 14.0 KB |
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