With collation TERRITORY_BASED, insert into table after changing type of column 
causes  assert failure and loss of connection
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                 Key: DERBY-2973
                 URL: https://issues.apache.org/jira/browse/DERBY-2973
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.4.0.0
            Reporter: Kathey Marsden
            Priority: Critical


ij(CONNECTION1)> create table d (id int not null, t_bigvarchar varchar(400), 
unique (id));
0 rows inserted/updated/deleted
ij(CONNECTION1)> create index t_bigvarchar_ind on d ( t_bigvarchar);
0 rows inserted/updated/deleted
ij(CONNECTION1)> alter table d alter t_bigvarchar set data type varchar(4096);
0 rows inserted/updated/deleted
ij(CONNECTION1)> insert into d (id, t_bigvarchar) values (1,'hello');
ERROR XJ001: Java exception: 'ASSERT FAILED type of inserted column[0] = 
org.apache.derby.iapi.types.SQLVarchartype of t
emplate column[0] = org.apache.derby.iapi.types.CollatorSQLVarchar: 
org.apache.derby.shared.common.sanity.AssertFailure'
.
ij(CONNECTION1)>

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