[BUGS] BUG in temp tables involving a temp table not properly hiding a regular table as well as allowing non-existent column names

[Frank van Vugt]

L.S.

Looking forward to your analysis of the following bug:


database=# select version();
                                version
------------------------------------------------------------------------
 PostgreSQL 8.0.3 on i586-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.3
(1 row)


****
**** START HERE TO REPRODUCE
****

CREATE TYPE full_sequence_type AS (id int);
CREATE OR REPLACE FUNCTION full_sequence(integer, integer)
        RETURNS SETOF full_sequence_type
        LANGUAGE 'plpgsql'
        IMMUTABLE
        STRICT
        SECURITY INVOKER
        AS '    DECLARE
                        my_from ALIAS FOR $1;
                        my_to ALIAS FOR $2;
                        result full_sequence_type%ROWTYPE;
                BEGIN
                        -- just loop
                        FOR i IN my_from..my_to LOOP
                                result.id = i;
                                RETURN NEXT result;
                        END LOOP;

                        -- finish
                        RETURN;
                END;';

-- create a regular table and show that it holds 100 records
create table f1 as select id as id2 from full_sequence(1, 100);
-- show that it holds 100 records
select count(*) from f1;

-- create a regular table and show that it holds 100 records
create temp table f1 as select id as id2 from full_sequence(1, 100);
select count(*) from f1;

-- remove 99 records from the temp table and show that 1 row remains
delete from f1 where id2 > 1;
select count(*) from f1;

-- try to select a non-existent column, show that it fails
select id from f1;
ERROR:  column "id" does not exist

-- however, the following query will happily run AND return a wrong result
-- based on the regular table instead of the temporary one
select count(*) from full_sequence(1, 100) where id in (select id from f1);
 count
-------
   100
(1 row)



****
**** USE THIS TO CLEANUP
****

DROP FUNCTION full_sequence(integer, integer);
DROP TYPE full_sequence_type;
DROP TABLE f1;
DROP TABLE f1;




-- 
Best,




Frank.


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