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https://issues.apache.org/jira/browse/DERBY-6665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071714#comment-14071714
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Rick Hillegas commented on DERBY-6665:
--------------------------------------
I'm going to take a look at the "ERROR XSAM5: Scan must be opened and
positioned by calling next() before making other calls." error which is being
raised in ConstraintCharacteristicsTest.testDeferredRowsInvalidation(). The
following script shows this error:
{noformat}
connect 'jdbc:derby:memory:db;create=true';
autocommit off;
create table t(i int, constraint c check (i > 0) initially deferred);
insert into t values -1, -2, -2, -3;
set constraints c immediate;
truncate table t;
-- this raises a scan error
commit;
{noformat}
> Violation of deferred constraints not detected when conglomerates are shared
> ----------------------------------------------------------------------------
>
> Key: DERBY-6665
> URL: https://issues.apache.org/jira/browse/DERBY-6665
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.11.0.0
> Reporter: Knut Anders Hatlen
> Attachments: braindump.diff,
> derby-6665-01-aa-remove-uniquePKConstraintModes.diff,
> derby-6665-01-ab-useTableUUIDforCheckConstraints.diff, junit.diff
>
>
> See the following script:
> {noformat}
> ij version 10.11
> ij> connect 'jdbc:derby:memory:db;create=true';
> ij> create table t1(x int primary key);
> 0 rows inserted/updated/deleted
> ij> create table t2(x int primary key);
> 0 rows inserted/updated/deleted
> ij> create table t3(x int, constraint fk1 foreign key (x) references t1
> initially deferred, constraint fk2 foreign key (x) references t2 initially
> deferred);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values 1;
> 1 row inserted/updated/deleted
> ij> autocommit off;
> ij> insert into t3 values 1;
> 1 row inserted/updated/deleted
> ij> insert into t2 values 1;
> 1 row inserted/updated/deleted
> ij> delete from t1;
> 1 row inserted/updated/deleted
> ij> commit;
> ij> select * from t1;
> X
> -----------
> 0 rows selected
> ij> select * from t2;
> X
> -----------
> 1
> 1 row selected
> ij> select * from t3;
> X
> -----------
> 1
> 1 row selected
> {noformat}
> Since T3.X contains a value (1) that is not present in T1, the foreign key
> FK1 is violated, and the COMMIT statement should have failed.
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