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https://issues.apache.org/jira/browse/DERBY-3094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567389#action_12567389
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Bryan Pendleton commented on DERBY-3094:
----------------------------------------
At generate time, as the code analyzes the expression a*(b/100.000000),
for the outer PRN, the sourceColumn's resultSetNumber for the
ColumnReference "a" is '1', while for "b" it is '2'.
So the overall expression is inconsistent; some of the column
reference point to the correct result set, others do not.
This makes me wonder whether there is some code which
traverses ResultColumn expression trees, updating the resultSetNumber,
that mistakenly visits the leftOperand of the expression tree but does
not visit the rightOperand.
"a" is seen while visiting the leftOperand, but to visit "b" one must visit
the rightOperand.
I thought this was a theory worth recording.
> 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
>
> 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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