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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-6371) DROP COLUMN looks in wrong schema when checking trigger dependencies
Date Fri, 04 Oct 2013 11:52:42 GMT
Knut Anders Hatlen created DERBY-6371:
-----------------------------------------

             Summary: DROP COLUMN looks in wrong schema when checking trigger dependencies
                 Key: DERBY-6371
                 URL: https://issues.apache.org/jira/browse/DERBY-6371
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.10.1.1
            Reporter: Knut Anders Hatlen


If you define a trigger in another schema than the current schema, and the trigger action
references tables in the current schema without explicit schema names, ALTER TABLE DROP COLUMN
may get confused when checking dependencies.

For example:

ij> create table s1.t1(x int, y int);
0 rows inserted/updated/deleted
ij> create table s1.t2(x int, y int);
0 rows inserted/updated/deleted
ij> set schema s1;
0 rows inserted/updated/deleted
ij> create trigger s2.tr after update of x on t1 for each row insert into t2(x) select
x from t1;
0 rows inserted/updated/deleted
ij> alter table s1.t1 drop column y restrict;
ERROR X0Y25: Operation 'DROP COLUMN' cannot be performed on object 'Y' because TRIGGER 'TR'
is dependent on that object.

The ALTER TABLE statement should have succeeded, because the trigger does not depend on column
Y.

If you create dummy tables in S2 with the same names as those in S1, the same ALTER TABLE
statement succeeds:

ij> create table s2.t1(x int);
0 rows inserted/updated/deleted
ij> create table s2.t2(x int);
0 rows inserted/updated/deleted
ij> alter table s1.t1 drop column y restrict;
0 rows inserted/updated/deleted

The existence of these unrelated tables should not affect whether you're allowed to drop the
column.



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