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https://issues.apache.org/jira/browse/DERBY-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514152
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Mamta A. Satoor commented on DERBY-2960:
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It appears that we are generating SQLVarchar rather than CollatorSQLVarchar for
the query above. I am working on the problem.
> Group by substr() on collated database causes ERROR XJ001: Java exception:
> 'ASSERT FAILED col1.getClass() (class org.apache.derby.iapi.types.SQLVarchar)
> expected to be the same as col2.getClass() (class
> org.apache.derby.iapi.types.CollatorSQLVarchar):
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-2960
> URL: https://issues.apache.org/jira/browse/DERBY-2960
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.4.0.0
> Reporter: Kathey Marsden
>
> ij> create table alltypes (i int, s smallint, l bigint, c char(10), v
> varchar(50), lvc long varchar,d double precision,
> r real, dt date, t time, ts timestamp, b char(2) for bit data, bv varchar(8)
> for bit data, lbv long varchar for bit data
> , dc decimal(5,2));
> 0 rows inserted/updated/deleted
> ij> select substr(c||v, 1, 4), count(*) from alltypes group by substr(c||v,
> 1, 4) ;
> 1 |2
> ----------------
> 0 rows selected
> ij> insert into alltypes values (0, 100, 1000000, 'duplicate', 'this is
> duplicated', 'also duplicated',200.0e0, 200.0e0,
> date('1992-01-01'), time('12:30:30'), timestamp('1992-01-01 12:30:30'),
> X'12af', x'0000111100001111', X'1234', 111.11)
> ;
> 1 row inserted/updated/deleted
> ij> insert into alltypes values (0, 100, 1000000, 'duplicate', 'this is
> duplicated', 'also duplicated',200.0e0, 200.0e0,
> date('1992-01-01'), time('12:30:30'), timestamp('1992-01-01 12:30:30'),
> X'12af', x'0000111100001111', X'1234', 111.11)
> ;
> 1 row inserted/updated/deleted
> ij> select substr(c||v, 1, 4), count(*) from alltypes group by substr(c||v,
> 1, 4) ;
> ERROR XJ001: Java exception: 'ASSERT FAILED col1.getClass() (class
> org.apache.derby.iapi.types.SQLVarchar) expected to b
> e the same as col2.getClass() (class
> org.apache.derby.iapi.types.CollatorSQLVarchar):
> org.apache.derby.shared.common.san
> ity.AssertFailure'.
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