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From: PG Bug reporting form <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: BUG #19470: PostgreSQL backend aborts (assert failure) when a prepared statement returns a composite type cast t
Date: Wed, 29 Apr 2026 11:27:19 +0000
Message-ID: <[email protected]> (raw)

The following bug has been logged on the website:

Bug reference:      19470
Logged by:          HaoGang Mao
Email address:      [email protected]
PostgreSQL version: 18.3
Operating system:   Linux
Description:        

Reproduction steps (minimal):
  BEGIN;
  CREATE TYPE foo AS (a int, b text);
  PREPARE p AS SELECT CAST(ROW(1, 'hello') AS foo)::text;
  EXECUTE p;
  ALTER TYPE foo ALTER ATTRIBUTE a TYPE VARCHAR(100);
  EXECUTE p;
  COMMIT;

Expected: Error message (type modified while a prepared plan / expression is
active)
Actual:   Server connection dropped; backend aborts with SIGABRT due to
assertion failure

Server log (trimmed):
  TRAP: failed Assert("false"), File: "heaptuple.c", Line: 1417, PID: <pid>
  ... heap_deform_tuple()

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  Subject: Re: BUG #19470: PostgreSQL backend aborts (assert failure) when a prepared statement returns a composite type cast t
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