Re: map_partition_varattnos() and whole-row vars

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