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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: hackerzheng666@gmail.com
Subject: BUG #19631: currtid2() on a view with GROUP BY ctid crashes with XX000
Date: Wed, 19 Aug 2026 03:51:52 +0000
Message-ID: <19631-b443dd6cd8d4e40b@postgresql.org> (raw)

The following bug has been logged on the website:

Bug reference:      19631
Logged by:          Zheng Hacker
Email address:      hackerzheng666@gmail.com
PostgreSQL version: 19beta3
Operating system:   Linux x86_64
Description:        

PostgreSQL version: 20devel (commit bdbf662, 2026-08-19)
  OS: Linux x86_64
  
  Calling currtid2() on a view whose SELECT includes ctid in a GROUP BY
  hits elog(ERROR) without errcode() in tid.c, producing SQLSTATE XX000.
  
  Reproducer:
  
  CREATE TABLE tid_tab (a int);
  INSERT INTO tid_tab VALUES (1);
  CREATE VIEW tid_view_with_ctid AS
    SELECT ctid, a FROM tid_tab GROUP BY ctid, a;
  SELECT currtid2('tid_view_with_ctid'::text, '(0,1)'::tid);
  -- ERROR: XX000: currtid cannot handle this view
  -- LOCATION: currtid_for_view, tid.c:435
  
  Note: the view has a ctid column (so it passes the tididx check at
  line 389 which does have a proper errcode), but the GROUP BY prevents
  the code from resolving the TLE to a simple base-table Var, so it
  falls through to the elog(ERROR) at line 435 which lacks errcode().
  
  Expected: a proper SQLSTATE (e.g. 0A000 feature_not_supported).

  Found by automated SQL fuzzing.
  Credit: Zheng Wang, Yanjie Zhao, Yiyang Liu

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