Re: [feature]COPY FROM enable FORCE_NULL/FORCE_NOT_NULL on all columns

HI,

I've looked at this patch and it looks mostly fine, though I do not
intend to commit it myself; perhaps Andrew will.

HI, Amit, thanks for review.

A few minor things to improve:

+      If <literal>*</literal> is specified, it will be applied in all columns.
...
+      If <literal>*</literal> is specified, it will be applied in all columns.

Please write "it will be applied in" as "the option will be applied to".

+1

+   bool        force_notnull_all;  /* FORCE_NOT_NULL * */
...
+   bool        force_null_all;     /* FORCE_NULL * */

Like in the comment for force_quote, please add a "?" after * in the
above comments.

+1

+   if (cstate->opts.force_notnull_all)
+       MemSet(cstate->opts.force_notnull_flags, true, num_phys_attrs
* sizeof(bool));
...
+   if (cstate->opts.force_null_all)
+       MemSet(cstate->opts.force_null_flags, true, num_phys_attrs *
sizeof(bool));

While I am not especially opposed to using this 1-line variant to set
the flags array, it does mean that there are now different styles
being used for similar code, because force_quote_flags uses a for
loop:

   if (cstate->opts.force_quote_all)
   {
       int         i;

       for (i = 0; i < num_phys_attrs; i++)
           cstate->opts.force_quote_flags[i] = true;
   }

Perhaps we could fix the inconsistency by changing the force_quote_all
code to use MemSet() too.  I'll defer whether to do that to Andrew's
judgement.

Sure, let’s wait for Andrew and I will put everything in one pot then.