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https://issues.apache.org/jira/browse/DERBY-5313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451658#comment-13451658
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Mamta A. Satoor commented on DERBY-5313:
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Following query is little bit simpler and gives the same exception
java -Dij.exceptionTrace=true org.apache.derby.tools.ij
connect 'jdbc:derby:db1;create=true';
create table t1(x1 int);
insert into t1 values 1;
create table t2(x2 int);
insert into t2 values 1;
select 1
from t1 join t2 on x1=x2
group by x1+x2;
> Assert failure with CASE expression in GROUP BY clause
> ------------------------------------------------------
>
> Key: DERBY-5313
> URL: https://issues.apache.org/jira/browse/DERBY-5313
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.3.0, 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2
> Reporter: Knut Anders Hatlen
> Labels: derby_triage10_9
>
> I see the following assert failure with debug jars on 10.5.3.0 and later
> (doesn't fail on 10.5.1.1 and earlier):
> ij> create table t(x int);
> 0 rows inserted/updated/deleted
> ij> insert into t values 1;
> 1 row inserted/updated/deleted
> ij> select case when a=1 then 1 else 2 end
> from t t1(a) join t t2(b) on a=b
> group by case when a=1 then 1 else 2 end;
> ERROR XJ001: Java exception: 'ASSERT FAILED retVN expected to be instanceof
> ColumnReference, not org.apache.derby.impl.sql.compile.ConditionalNode:
> org.apache.derby.shared.common.sanity.AssertFailure'.
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