Re: Add support for DEFAULT specification in COPY FROM - Mailing list pgsql-hackers

From Zhihong Yu
Subject Re: Add support for DEFAULT specification in COPY FROM
Date
Msg-id CALNJ-vT09rVCOZ0fKt68+B6pSckuFqa5uC2nKxt=yNJj3=OCPQ@mail.gmail.com
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In response to Re: Add support for DEFAULT specification in COPY FROM  (Israel Barth Rubio <barthisrael@gmail.com>)
Responses Re: Add support for DEFAULT specification in COPY FROM
List pgsql-hackers


On Fri, Oct 7, 2022 at 12:09 PM Israel Barth Rubio <barthisrael@gmail.com> wrote:
Hello Zhihong,

> +               /* attribute is NOT to be copied from input */ 
> I think saying `is NOT copied from input` should suffice.

> +           /* fieldno is 0-index and attnum is 1-index */
> 0-index -> 0-indexed

I have applied both suggestions, thanks! I'll submit a 4th version
of the patch soon.

> +   defaults = (bool *) palloc0(num_phys_attrs * sizeof(bool));
> +   MemSet(defaults, false, num_phys_attrs * sizeof(bool));
> Is the MemSet() call necessary ?

I would say it is, so it initializes the array with all flags set to false.
Later, if it detects attributes that should evaluate their default expression,
it would set the flag to true.

Am I missing something?

Regards,
Israel.
Hi,
For the last question, please take a look at:

#define MemSetAligned(start, val, len) \ 

which is called by palloc0().

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