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https://issues.apache.org/jira/browse/DERBY-3094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570074#action_12570074
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Bryan Pendleton commented on DERBY-3094:
----------------------------------------
Here's an interesting essay on the sort of subtle problems that can arise
from not being crystal-clear about the semantics of column references and
expressions in GROUP BY clauses:
http://odetocode.com/Blogs/scott/archive/2005/04/17/1214.aspx
> Grouping of expressions causes NullPointerException
> ---------------------------------------------------
>
> Key: DERBY-3094
> URL: https://issues.apache.org/jira/browse/DERBY-3094
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.1.4
> Environment: Windows XP, Eclipse 3.2.2, java 1.5.0.11
> Reporter: Peter Balon
> Assignee: Bryan Pendleton
> Priority: Critical
> Attachments: modifyVisitorDoesntWork.diff, twoPass.diff
>
>
> 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
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