Обсуждение: Brokenness in dump/restore for GENERATED expressions

Using today's HEAD, the regression database cannot be dumped and
restored normally.  Since the buildfarm isn't all red, I suppose
it works in --binary-upgrade mode ... but if I just do

$ make installcheck  # to set up the test database
$ pg_dump -Fc regression >r.dump
$ createdb r2
$ pg_restore -d r2 r.dump

I get

pg_restore: while PROCESSING TOC:
pg_restore: from TOC entry 6016; 2604 24926 DEFAULT gtest1_1 b postgres
pg_restore: error: could not execute query: ERROR:  column "b" of relation "gtest1_1" is a generated column
Command was: ALTER TABLE ONLY public.gtest1_1 ALTER COLUMN b SET DEFAULT (a * 2);


pg_restore: from TOC entry 6041; 2604 25966 DEFAULT gtest30_1 b postgres
pg_restore: error: could not execute query: ERROR:  cannot use column reference in DEFAULT expression
Command was: ALTER TABLE ONLY public.gtest30_1 ALTER COLUMN b SET DEFAULT (a * 2);


pg_restore: warning: errors ignored on restore: 2

            regards, tom lane

On 2020-01-30 19:54, Tom Lane wrote:
> Using today's HEAD, the regression database cannot be dumped and
> restored normally.  Since the buildfarm isn't all red, I suppose
> it works in --binary-upgrade mode ... but if I just do
> 
> $ make installcheck  # to set up the test database
> $ pg_dump -Fc regression >r.dump
> $ createdb r2
> $ pg_restore -d r2 r.dump
> 
> I get
> 
> pg_restore: while PROCESSING TOC:
> pg_restore: from TOC entry 6016; 2604 24926 DEFAULT gtest1_1 b postgres
> pg_restore: error: could not execute query: ERROR:  column "b" of relation "gtest1_1" is a generated column
> Command was: ALTER TABLE ONLY public.gtest1_1 ALTER COLUMN b SET DEFAULT (a * 2);
> 
> 
> pg_restore: from TOC entry 6041; 2604 25966 DEFAULT gtest30_1 b postgres
> pg_restore: error: could not execute query: ERROR:  cannot use column reference in DEFAULT expression
> Command was: ALTER TABLE ONLY public.gtest30_1 ALTER COLUMN b SET DEFAULT (a * 2);

This is the same issue as 
<https://www.postgresql.org/message-id/15830.1575468847@sss.pgh.pa.us>. 
I will work in it this week.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services