BUG #18878: PostgreSQL triggers Assertion Failure in Debug build

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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: luy70@psu.edu
Date: 2025-04-04T19:15:14Z
Lists: pgsql-bugs
The following bug has been logged on the website:

Bug reference:      18878
Logged by:          Yu Liang
Email address:      luy70@psu.edu
PostgreSQL version: 17.4
Operating system:   Ubuntu 24.04 LTS ARM64 VM
Description:        

In the debug build of PostgreSQL 17.4, compiled with `configure
--enable-debug --prefix=$(pwd) --exec-prefix=$(pwd) --enable-cassert`,
triggered Assertion Failure when executing the following statement: 

```sql
WITH RECURSIVE ta01 AS NOT MATERIALIZED ( WITH RECURSIVE any_cte_name AS
MATERIALIZED ( TABLE ta01 ) DELETE FROM v00 RETURNING *, CASE WHEN FALSE
THEN TRUE WHEN FALSE THEN TRUE ELSE TRUE END IDENT ) SELECT FROM JSON_ARRAY
( TABLE v00 ORDER BY CASE WHEN FALSE THEN TRUE END NULLS FIRST FOR READ
ONLY) GROUP BY ROLLUP ( CASE WHEN FALSE NOT BETWEEN ASYMMETRIC CASE WHEN
FALSE THEN TRUE END AND FALSE <> CASE WHEN EXISTS ( SELECT GROUP BY ALL ( )
FOR READ ONLY ) > CASE WHEN FALSE THEN TRUE END THEN FALSE END IS NULL THEN
ARRAY ( ( TABLE ta01 ) ) ELSE CASE WHEN TRUE BETWEEN EXISTS ( SELECT GROUP
BY ALL ( ) FOR READ ONLY ) AND TRUE IS NOT FALSE > EXISTS ( SELECT ALL GROUP
BY ( ) FOR READ ONLY ) THEN TRUE END > CASE WHEN FALSE THEN TRUE END END )
FOR READ ONLY;
```

The triggered assertion is: "cte->cterecursive || !rte->self_reference".
"src/backend/parser/parse_relation.c", Line: 2338.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →
  1. Fix parse_cte.c's failure to examine sub-WITHs in DML statements.