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From "A B (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-939) NullPointerException at ResultSet.close() time for simple query using UNION and INTERSECT
Date Thu, 27 Jul 2006 00:01:15 GMT
    [ http://issues.apache.org/jira/browse/DERBY-939?page=comments#action_12423743 ] 
            
A B commented on DERBY-939:
---------------------------

Review comments can be found here:

  http://article.gmane.org/gmane.comp.apache.db.derby.devel/24721

> NullPointerException at ResultSet.close() time for simple query using UNION and INTERSECT
> -----------------------------------------------------------------------------------------
>
>                 Key: DERBY-939
>                 URL: http://issues.apache.org/jira/browse/DERBY-939
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.0.0, 10.1.3.0
>         Environment: Embedded and server modes, with derby.language.logQueryPlan=true
>            Reporter: A B
>         Assigned To: Yip Ng
>            Priority: Minor
>         Attachments: derby939trunkdiffpatch1.txt, derby939trunkstatpatch1.txt
>
>
> If I set "derby.language.logQueryPlan" to true and then attempt to execute the following
simple query using UNION and INTERSECT, Derby will return the correct results and then, _after_
returning the results, will throw a NullPointerException.  This error also occurs for 10.1.
> To reproduce:
> > java -Dderby.language.logQueryPlan=true org.apache.derby.tools.ij
> and then do:
> create table t1 (i int);
> create table t2 (j int);
> create table t3 (a int);
> ij> select i from t1 union (select j from t2 intersect select a from t3);
> 1
> -----------
> 0 rows selected
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> If I add data, the query will return the correct results,  but then throw the NPE.
> insert into t1 values 1, 2, 3, 4, 5;
> insert into t2 values 2, 4, 6, 8, 10;
> insert into t3 values 2, 3, 4;
> ij> select i from t1 union (select j from t2 intersect select a from t3);
> 1
> -----------
> 1
> 2
> 3
> 4
> 5
> 5 rows selected
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> The embedded and client stack traces are shown below. Both suggest that the problem occurs
during the close of the result set.
> -- Embedded --
> java.lang.NullPointerException
> 	at org.apache.derby.impl.sql.execute.rts.RealUnionResultSetStatistics.getStatementExecutionPlanText(RealUnionResultSetStatistics.java:107)
> 	at org.apache.derby.impl.sql.execute.rts.RealSortStatistics.getStatementExecutionPlanText(RealSortStatistics.java:124)
> 	at org.apache.derby.impl.sql.execute.rts.RunTimeStatisticsImpl.getStatementExecutionPlanText(RunTimeStatisticsImpl.java:293)
> 	at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.finishAndRTS(BasicNoPutResultSetImpl.java:633)
> 	at org.apache.derby.impl.sql.execute.SortResultSet.finish(SortResultSet.java:479)
> 	at org.apache.derby.impl.jdbc.EmbedResultSet.close(EmbedResultSet.java:533)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:272)
> 	at org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:260)
> 	at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:381)
> 	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:434)
> 	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
> 	at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
> 	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
> 	at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:55)
> 	at org.apache.derby.tools.ij.main(ij.java:60)
> -- Client --
> ERROR (no SQLState): actual code point, 4692 does not match expected code point, 9224
> java.sql.SQLException: actual code point, 4692 does not match expected code point, 9224
>         at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:280)
>         at org.apache.derby.client.am.ResultSet.close(ResultSet.java:412)
>         at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:272)
>         at org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:260)
>         at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:381)
>         at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:434)
>         at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
>         at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
>         at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
>         at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:55)
>         at org.apache.derby.tools.ij.main(ij.java:60)
> Caused by: org.apache.derby.client.am.DisconnectException: actual code point, 4692 does
not match ex
> pected code point, 9224
>         at org.apache.derby.client.net.Reply.zThrowSyntaxError(Reply.java:1157)
>         at org.apache.derby.client.net.Reply.parseLengthAndMatchCodePoint(Reply.java:1057)
>         at org.apache.derby.client.net.NetConnectionReply.parseSQLCARD(NetConnectionReply.java:2519)
>         at org.apache.derby.client.net.NetConnectionReply.parseRDBCMMreply(NetConnectionReply.java:2
> 00)
>         at org.apache.derby.client.net.NetConnectionReply.readLocalCommit(NetConnectionReply.java:13
> 3)
>         at org.apache.derby.client.net.ConnectionReply.readLocalCommit(ConnectionReply.java:42)
>         at org.apache.derby.client.net.NetConnection.readLocalCommit_(NetConnection.java:1347)
>         at org.apache.derby.client.am.Connection.readCommit(Connection.java:624)
>         at org.apache.derby.client.am.Connection.readAutoCommit(Connection.java:614)
>         at org.apache.derby.client.am.ResultSet.readAutoCommitIfNotAutoCommitted(ResultSet.java:509)
>         at org.apache.derby.client.am.ResultSet.readCloseAndAutoCommit(ResultSet.java:474)
>         at org.apache.derby.client.am.ResultSet.flowCloseAndAutoCommitIfNotAutoCommitted(ResultSet.j
> ava:455)
>         at org.apache.derby.client.am.ResultSet.closeX(ResultSet.java:425)
>         at org.apache.derby.client.am.ResultSet.close(ResultSet.java:407)
> ERROR XJ001: DERBY SQL error: SQLCODE: -1, SQLSTATE: XJ001, SQLERRMC: java.lang.NullPointerException
> [XX] XJ001.U
> java.sql.SQLException: DERBY SQL error: SQLCODE: -1, SQLSTATE: XJ001, SQLERRMC: java.lang.NullPointerException[XX]XJ001.U
>         at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:280)
>         at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:295)
>         at org.apache.derby.client.am.ResultSet.close(ResultSet.java:412)
>         at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:272)
>         at org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:260)
>         at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:381)
>         at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:434)
>         at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
>         at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
>         at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
>         at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:55)
>         at org.apache.derby.tools.ij.main(ij.java:60)

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