Обсуждение: BUG #17662: Error on UPDATE with ()

The following bug has been logged on the website:

Bug reference:      17662
Logged by:          Julio Figueiredo
Email address:      julionti@gmail.com
PostgreSQL version: 14.4
Operating system:   CENTOS8
Description:

The bellow command return : ERROR: source for a multiple-column UPDATE item
must be a sub-SELECT or ROW() expression
update table set
(column)=(value)
where 1=2

if I use
update table set
(column1,c2)=(v1,v2)
where 1=2

everithing is ok

PG Bug reporting form <noreply@postgresql.org> writes:
> The bellow command return : ERROR: source for a multiple-column UPDATE item
> must be a sub-SELECT or ROW() expression
> update table set
> (column)=(value)
> where 1=2

The error is telling you what to do.  You should write:

update table set
(column) = ROW(value)
where 1=2

The ROW keyword is optional for a multi-column row, since
(v1,v2) couldn't mean anything else.  But if there's just
one item, the parentheses are noise; they don't turn it
into a row.

            regards, tom lane