Assert failure (sane) or NullPointerException (insane) when attempting to GROUP 
BY expression containing scalar subquery
------------------------------------------------------------------------------------------------------------------------

                 Key: DERBY-4403
                 URL: https://issues.apache.org/jira/browse/DERBY-4403
             Project: Derby
          Issue Type: Bug
          Components: SQL
            Reporter: Dag H. Wanvik


The following is not caught by the error checking:

select sum(i) from t group by j + (select j from t where i=1)

java.sql.SQLException: Java exception: 'ASSERT FAILED dummySubqueryList.size() 
is expected to be 0: org.apache.derby.shared.common.sanity.AssertFailure'.
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:119)
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
        ... 16 more
Caused by: org.apache.derby.shared.common.sanity.AssertFailure: ASSERT FAILED 
dummySubqueryList.size() is expected to be 0
        at 
org.apache.derby.shared.common.sanity.SanityManager.ASSERT(SanityManager.java:120)
        at 
org.apache.derby.impl.sql.compile.GroupByList.bindGroupByColumns(GroupByList.java:220)
        at 
org.apache.derby.impl.sql.compile.SelectNode.bindExpressions(SelectNode.java:629)
        at 
org.apache.derby.impl.sql.compile.DMLStatementNode.bindExpressions(DMLStatementNode.java:227)
        at 
org.apache.derby.impl.sql.compile.DMLStatementNode.bind(DMLStatementNode.java:140)
        at 
org.apache.derby.impl.sql.compile.CursorNode.bindStatement(CursorNode.java:249)
        at 
org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:319)
        at 
org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:88)
        at 
org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:824)
        at 
org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:606)

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