Re: BUG #16978: Nested CTEs give ERROR in v13

PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> This narrowed down SQL (from what SQLSmith generated) seems to error out
> only with N levels of CTE nesting - no tables / views / 1-row output.
> The SQL works fine with v12.4 but raises an ERROR in v13 which seems like a
> regression. Is this owing a recent change in v13 - that could affect this?

FWIW, I don't see any error from this, either in HEAD or the
back branches.

$ cat recursive.sql
WITH RECURSIVE w6(c6) AS
(WITH w6(c6) AS
(WITH w8(c8) AS
(WITH w9(c9) AS
(WITH w10(c10) AS
(WITH w11(c11) AS
(WITH w_err(c12) AS
(SELECT 1)
SELECT * FROM w_err)
SELECT * FROM w11)
SELECT * FROM w10)
SELECT * FROM w9)
SELECT * FROM w8)
SELECT * FROM w6)
SELECT * FROM w6;
$ psql -f recursive.sql
c6
----
1
(1 row)

regards, tom lane