[HACKERS] improper call to spi_printtup ???

[Darko Prenosil]

I have set returning function written in 'c', declared as:

CREATE OR REPLACE FUNCTION check_view (text,text) RETURNS setof pg_attribute
  AS '/usr/local/pgsql/lib/libplpq.so','check_view' LANGUAGE 'c'
  WITH (isstrict);

When I call this function from psql :
        SELECT attrelid,attnum FROM check_view('pg_catalog','pg_tables') ;
I have:
         attrelid | attnum
        ----------+--------
            16595 |      1
             1259 |      1
                0 |      0
             1259 |     11
             1259 |     22
                0 |      0
That is expected result, or in other words it works fine.

Now when I try to use 'check_view0 function in some other pl/psql function:

        CREATE OR REPLACE FUNCTION testfunc() RETURNS bool AS '
        BEGIN
                SELECT attrelid,attnum FROM check_view(''pg_catalog'',''pg_tables'') ;
                RETURN FALSE;
        END;' LANGUAGE 'plpgsql';

        SELECT testfunc() ;

I have:
        (-403)ERROR:  improper call to spi_printtup
        CONTEXT:  PL/pgSQL function "testfunc" line 2 at SQL statement

Anyone knows what I'm doing wrong ? Is there some special issue when writing 
functions for pl/psql that I'm not aware ?
        

Thanks in advance !

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