| From: | Aleksander Alekseev <aleksander(at)timescale(dot)com> |
|---|---|
| To: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, exclusion(at)gmail(dot)com |
| Subject: | Re: BUG #18536: Using WITH inside WITH RECURSIVE triggers a "shouldn't happen" error |
| Date: | 2024-07-15 12:16:09 |
| Message-ID: | CAJ7c6TN+f4duGn2cfHsgMiYUe+9uHek4DsD_a3yV6y2NCq9XCQ@mail.gmail.com |
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| Lists: | pgsql-bugs |
Hi,
> triggers an error:
> ERROR: XX000: missing recursive reference
> LOCATION: checkWellFormedRecursion, parse_cte.c:896
FWIW I couldn't reproduce the reported error on REL_17_STABLE
(b8bf76cbde39). The error I got seems reasonable:
```
46087 (master) =# WITH RECURSIVE t(n) AS (
WITH t1 AS (SELECT 1 FROM t) SELECT 1
UNION
SELECT 1 FROM t1)
SELECT * FROM t;
ERROR: recursive reference to query "t" must not appear within a subquery
LINE 2: WITH t1 AS (SELECT 1 FROM t) SELECT 1
^
```
We should add regression tests though, as v2 does.
--
Best regards,
Aleksander Alekseev
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