CHECK constraints involving user-coded functions may return different results
depending on who performs the trigging INSERT/UPDATE
----------------------------------------------------------------------------------------------------------------------------------
Key: DERBY-3944
URL: https://issues.apache.org/jira/browse/DERBY-3944
Project: Derby
Issue Type: Bug
Components: SQL
Reporter: Rick Hillegas
When compiling a CHECK constraint on behalf of an INSERT/UPDATE statement,
Derby uses the current schema in order to resolve unqualified function names
which appear in the CHECK constraint. This means that the CHECK constraint may
evaluate true for some users, false for others, and for others the CHECK
constraint may raise an error saying that Derby can't resolve the function
reference. This behavior violates the "retrospective determinacy" of CHECK
constraints as specified by part 2 of the ANSI/ISO standard:
1) section 11.9 (<check constraint definition>), syntax rule 5
2) same section, general rule 1
3) section 11.6 (<table constraint definition>), general rule 3
4) section 4.16 (Determinism)
For more discussion, please see this email thread:
http://www.nabble.com/Problem-with-CHECK-constraints-td20445344.html#a20445344
The following script demonstrates this problem:
connect
'jdbc:derby:derbyauth;create=true;user=test_dbo;password=test_dbopassword' as
test_dbo_conn;
drop table t_bp_2;
drop function f_fp_minus;
create function f_fp_minus
(
a int
)
returns int
language java
deterministic
parameter style java
no sql
external name
'org.apache.derbyTesting.functionTests.tests.lang.GeneratedColumnsTest.minus'
;
create table t_bp_2( a int, constraint t_bp_2_check check ( f_fp_minus( a ) < 0
) );
grant insert on t_bp_2 to public;
insert into test_dbo.t_bp_2( a ) values ( 100 );
connect 'jdbc:derby:derbyauth;create=true;user=janet;password=janetpassword' as
janet_conn;
insert into test_dbo.t_bp_2( a ) values ( 100 );
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
