On Mon, 2023-02-06 at 12:04 -0500, Philip Semanchuk wrote:
> I have a column defined GENERATED ALWAYS AS {my_expression} STORED. I’d like
> to change the
> {my_expression} part. After reading the documentation for ALTER TABLE
> (https://www.postgresql.org/docs/current/sql-altertable.html) and trying a
> few things that
> resulted in syntax errors, there doesn’t seem to be a way to alter the
> column’s GENERATED
> expression in place. It seems like my only option is to drop and re-add the
> column.
> Is that correct?
I think that is correct. But changing the expression would mean rewriting the
column
anyway. The only downside is that a dropped column remains in the table, and
no even
a VACUUM (FULL) will get rid of it.
Yours,
Laurenz Albe
