Re: Add RESPECT/IGNORE NULLS and FROM FIRST/LAST options

>>>> Also the error is certainly user-facing,
>>>> so using elog() was quite inappropriate.  It should be ereport with an
>>>> errcode of (probably) ERRCODE_FEATURE_NOT_SUPPORTED.  Rolling your
>>>> own implementation of get_func_name() wasn't great either.
>>> 
>>> I overlooked the elog() call and "own implementation of
>>> get_func_name()". Will fix.
>> 
>> Attached is a trivial patch to fix that. I am going to push it if
>> there's no objection.
>> 
>> Best regards,
>> --
>> Tatsuo Ishii
>> SRA OSS K.K.
>> English: http://www.sraoss.co.jp/index_en/
>> Japanese:http://www.sraoss.co.jp
>> <v1-0001-Use-ereport-rather-than-elog-in-WinCheckAndInitia.patch>
> 
> 
> I just take a quick look at the patch, a tiny comment is:
> 
> ```
> +        char       *funcname = get_func_name(fcinfo->flinfo->fn_oid);
> ```
> 
> This can be a “const char *”.

Thanks for the review. In addition to the point, I added an assertion
which is called by all other window function API. Also added check to
the return value of get_func_name() because it could return NULL. V2
patch attached.

Best regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp