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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (DERBY-3944) CHECK constraints involving user-coded functions may return different results depending on who performs the triggering INSERT/UPDATE
Date Wed, 02 Feb 2011 23:40:28 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kathey Marsden reopened DERBY-3944:
-----------------------------------


Reopen for backport

> CHECK constraints involving user-coded functions may return different results depending
on who performs the triggering INSERT/UPDATE
> ------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3944
>                 URL: https://issues.apache.org/jira/browse/DERBY-3944
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.1.1
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>             Fix For: 10.7.1.1
>
>         Attachments: derby-3944-01-aa-useOriginalSchema.diff, derby-3944-01-ab-useOriginalSchema.diff
>
>
> 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 );

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