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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: svenna01@gmail.com
Subject: BUG #19559: ALTER TABLE SET EXPRESSION / ALTER TYPE fails on columns referenced by a property graph
Date: Sat, 18 Jul 2026 11:21:30 +0000
Message-ID: <19559-6e5d454d86f920e7@postgresql.org> (raw)

The following bug has been logged on the website:

Bug reference:      19559
Logged by:          Fredrik Svensson
Email address:      svenna01@gmail.com
PostgreSQL version: 19beta2
Operating system:   Linux (Debian trixie, official postgres:19beta2
Description:        

On 19beta2:

      CREATE TABLE t (id int PRIMARY KEY, a int, b int,
        s int GENERATED ALWAYS AS (a + b) STORED);
      ALTER TABLE t ALTER COLUMN s SET EXPRESSION AS (a - b);   -- ok
      CREATE PROPERTY GRAPH g
        VERTEX TABLES (t KEY (id) LABEL v PROPERTIES (id, s));
      ALTER TABLE t ALTER COLUMN s SET EXPRESSION AS (a * b);
      ERROR:  unexpected object depending on column: property s of label v
of vertex t of property graph g

Cause:
CREATE PROPERTY GRAPH records per-column dependencies (element keys via
array_of_attnums_to_objectaddrs, property expressions via
recordDependencyOnSingleRelExpr), but RememberAllDependentForRebuilding() in
tablecmds.c has no cases for PropgraphElementRelationId /
PropgraphLabelPropertyRelationId, so they reach the default: elog.
Still present in master as of dde9a87d4d0.

Expected, following the existing pattern in that switch:
  - AT_AlterColumnType: user-facing ERRCODE_FEATURE_NOT_SUPPORTED error.
  - AT_SetExpression: no error — column attnum and type are unchanged, so
there is nothing to rebuild.

Message-ID: <19559-6e5d454d86f920e7@postgresql.org>
Permalink:  ../19559-6e5d454d86f920e7@postgresql.org/
Also on:    postgresql.org/message-id/19559-6e5d454d86f920e7@postgresql.org

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