Question about "Unrecognized SPI code" ...

I just found an interesting issue in recent PostgreSQL releases:

CREATE VIEW view_nonsense AS SELECT 1 AS a, 2 AS b;

CREATE RULE myrule AS ON INSERT TO view_nonsense
DO INSTEAD NOTHING;

CREATE OR REPLACE FUNCTION debug() RETURNS boolean AS '
DECLARE

BEGIN
INSERT INTO view_nonsense VALUES (10, 20);
RETURN true;
END;
' LANGUAGE 'plpgsql';

SELECT debug();

The INSERT statement is not doing something useful here

[hs(at)athlon tmp]$ psql test < view.sql
CREATE VIEW
CREATE RULE
CREATE FUNCTION
ERROR: SPI_execute_plan failed executing query "INSERT INTO
view_nonsense VALUES (10, 20)": Unrecognized SPI code 0
CONTEXT: PL/pgSQL function "debug" line 4 at SQL statement

SPI_result_code_string(int code) and PL/pgSQL don't seem to be aware of
DO NOTHING rules.
Is it desired behaviour?

Best regards,

Hans

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