bug: PG generated column incorrectly fallback to expression evaluation

[MrCroxx]

Describe the bug

In PG:

CREATE TABLE foos (
    id SERIAL PRIMARY KEY,
    height_cm NUMERIC,
    height_in NUMERIC GENERATED ALWAYS AS (height_cm / 2.54) STORED
);
INSERT INTO foos(height_cm) VALUES (100);
select * from foos;

Got:

 id | height_cm |      height_in      
----+-----------+---------------------
  1 |       100 | 39.3700787401574803

In RW:

CREATE TABLE foos (id INT  PRIMARY KEY, height_cm NUMERIC, height_in NUMERIC) FROM "primary_cdc" TABLE 'public.foos';
select * from foos;

Got:

 id | height_cm | height_in 
----+-----------+-----------
  1 |       100 |          

The height_in column is NULL.

Error message/log

2025-06-16T21:24:05.494375059+08:00  WARN risingwave_connector_node: Cannot parse column default value '(height_cm / 2.54)' to type 'numeric'. Expression evaluation is not supported. thread="debezium-postgresconnector-RW_CDC_10-change-event-source-coordinator" class="io.debezium.connector.postgresql.connection.PostgresDefaultValueConverter"

To Reproduce

No response

Expected behavior

Same result as PG.

How did you deploy RisingWave?

No response

The version of RisingWave

No response

Additional context

No response