On 09.01.25 13:41, jian he wrote:
we can not ALTER COLUMN DROP EXPRESSION for virtual for now.
so the following comments in generated_virtual.sql conflict with the output.
```
-- check that dependencies between columns have also been removed
ALTER TABLE gtest29 DROP COLUMN a;  -- should not drop b
\d gtest29
```
we can also comment out line 557 in generated_virtual.sql.

Ok will do.

attach patch is removing unnecessary parentheses from
```ereport(ERROR, (errcode```
only for this patch related.
per commit 
https://git.postgresql.org/cgit/postgresql.git/commit/?id=e3a87b4991cc2d00b7a3082abb54c5f12baedfd1

also https://www.postgresql.org/docs/current/error-message-reporting.html says
  ""The extra parentheses were required before PostgreSQL version 12,
but are now optional.""

Right. I tried to keep it mostly consistent with existing surrounding code, but I will do another pass to improve that.



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