[PostgreSQL-Hackers] Re: [GENERAL] pg_attribute.attnum - wrong column ordinal?

I'd vote against it, at least until we have something better than a
row_number solution. That would create another huge performance penalty
on views that are already ungodly slow.

When and if we get around to separating physical from logical column
position, the issue might go away "for free".

regards, tom lane

Should be easy to test the performance impact of this, since the limit
for columns per table is 1600.