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Date: Fri, 10 Sep 2010 12:23:33 -0400 (EDT)
From: "Dag H. Wanvik (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Created: (DERBY-4798) NPE in nested outer join
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NPE in nested outer join
------------------------

                 Key: DERBY-4798
                 URL: https://issues.apache.org/jira/browse/DERBY-4798
             Project: Derby
          Issue Type: Bug
    Affects Versions: 10.6.1.0, 10.5.3.0, 10.5.2.0, 10.5.1.1
            Reporter: Dag H. Wanvik


Using the schema from DERBY-4712 and running the original randomized query generator used to find DERBY-4712, http://code.google.com/p/h2database/source/browse/trunk/h2/src/test/org/h2/test/db/TestNestedJoins.java, I have uncovered yet another bug (NPE), which appears to be a different beast. This one is a regression in 10.5 (works in 10.4 and older). This is the failing query:

SELECT t0.x0,
       t1.x1,
       t2.x2,
       t3.x3,
       t4.x4,
       t5.x5,
       t6.x6,
       t7.x7
FROM ((t0
         LEFT OUTER JOIN ((t1
                           LEFT OUTER JOIN (t2
                                            LEFT OUTER JOIN t3
                                              ON t2.x2 = t3.x3 )
                             ON t1.x1 = t2.x2 )
                          LEFT OUTER JOIN (t4
                                           INNER JOIN (t5
                                                       LEFT OUTER JOIN t6
                                                         ON t5.x5 = t6.x6 )
                                             ON t4.x4 = t5.x5 )
                            ON t1.x1 = t5.x5 )
           ON t0.x0 = t5.x5 )
        LEFT OUTER JOIN t7
          ON t3.x3 = t7.x7 ); 

Relevant part of the stack trace (using 10.5 trunk @ svn 995846):

Caused by: java.lang.NullPointerException
	at org.apache.derby.impl.sql.execute.BaseActivation.getColumnFromRow(BaseActivation.java:1458)
	at org.apache.derby.exe.ac4ac48095x012axfc73x9c5dx000003d485d847.e19(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(ReflectMethod.java:46)
	at org.apache.derby.impl.sql.execute.GenericQualifier.getOrderable(GenericQualifier.java:96)
	at org.apache.derby.impl.sql.execute.NoPutResultSetImpl.clearOrderableCache(NoPutResultSetImpl.java:307)
	at org.apache.derby.impl.sql.execute.HashScanResultSet.resetProbeVariables(HashScanResultSet.java:359)
	at org.apache.derby.impl.sql.execute.HashScanResultSet.openCore(HashScanResultSet.java:322)
	at org.apache.derby.impl.sql.execute.JoinResultSet.openRight(JoinResultSet.java:283)
	at org.apache.derby.impl.sql.execute.JoinResultSet.openCore(JoinResultSet.java:152)
	at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(ProjectRestrictResultSet.java:181)
	at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(BasicNoPutResultSetImpl.java:251)
	at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(GenericPreparedStatement.java:416)

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