[DERBY-3094] Grouping of expressions causes NullPointerException

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 10.3.1.4
• Fix Version/s: 10.3.3.0, 10.4.1.3
• Component/s: SQL
• Environment: Windows XP, Eclipse 3.2.2, java 1.5.0.11
• Assignee: Bryan Pendleton
• Reporter: Peter Balon
• Created: 02/Oct/07 08:12
• Updated: 21/Jan/11 17:50
• Resolved: 02/Mar/08 16:16

Description

Following steps to reproduce the bug:

create table xx (a double, b double);
insert into xx values (2, 3);

select a, a*(b/100.000000), count from xx group by a, a*(b/100.000000);

Starting run

select a, a*(b/100.000000), count from xx
group by a, a*(b/100.000000)

Run successful

SQL State = 38000 SQL Code = 20000 SQL Message = Bei der Auswertung eines Ausdrucks wurde die Ausnahme 'java.lang.NullPointerException' ausgelöst. Exception message = java.sql.SQLException: Bei der Auswertung eines Ausdrucks wurde die Ausnahme 'java.lang.NullPointerException' ausgelöst.

Work around:

select a, a*(b/100.000000), count from xx group by a, b, a*(b/100.000000)

Stack trace from application:

java.sql.SQLException: Bei der Auswertung eines Ausdrucks wurde die Ausnahme 'java.lang.NullPointerException' ausgelöst.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
at de.arcor.billy.report.views.designer.ReportViewerView.setInput(ReportViewerView.java:255)
at de.arcor.billy.report.views.designer.ReportViewerView.createPartControl(ReportViewerView.java:113)
at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:332)
at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:197)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566)
at org.eclipse.ui.internal.Perspective.showView(Perspective.java:1675)
at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:987)
at org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:968)
at org.eclipse.ui.internal.WorkbenchPage$13.run(WorkbenchPage.java:3514)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3511)
at de.arcor.billy.report.data.ReportDataAdvisor$2.perspectiveChanged(ReportDataAdvisor.java:268)
at de.arcor.billy.system.actions.AbstractOpenPerspectiveActionDelegate$1.run(AbstractOpenPerspectiveActionDelegate.java:66)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3325)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1930)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1894)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at de.arcor.billy.product.Billy.run(Billy.java:15)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)
Caused by: java.sql.SQLException: Java-Ausnahme: ': java.lang.NullPointerException'.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
... 42 more
Caused by: java.lang.NullPointerException
at org.apache.derby.exe.ac9b638174x0115x5f93x1332x0000046fd8a01b.e10(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(Unknown Source)
at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.doProjection(Unknown Source)
at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(Unknown Source)
at org.apache.derby.impl.sql.execute.ScrollInsensitiveResultSet.getNextRowFromSource(Unknown Source)
at org.apache.derby.impl.sql.execute.ScrollInsensitiveResultSet.getNextRowCore(Unknown Source)
at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(Unknown Source)
... 37 more

Issue Links

• blocks: DERBY-2457 Use of column aliases in group by / having clauses can cause queries to fail
• is related to: DERBY-883 Enhance GROUP BY clause to support expressions instead of just column references.
• is related to: DERBY-1624 use of direct column name rather than alias make aggregation fail (Hibernate depends on that)
• relates to: DERBY-3097 Unnecessary if statement can be removed from BaseActivation.getColumnFromNow