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Date: Thu, 19 Nov 2009 00:23:39 +0000 (UTC)
From: "Bryan Pendleton (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4450) GROUP BY in an IN-subquery inside
 HAVING clause whose select list is subset of group by columns, gives NPE
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    [ https://issues.apache.org/jira/browse/DERBY-4450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779757#action_12779757 ] 

Bryan Pendleton commented on DERBY-4450:
----------------------------------------

> select sum(j) from t group by i having i in (select i from t group by i,j );

Is this legal? I thought that a HAVING clause could only mention items in the result column list.

> GROUP BY in an IN-subquery inside HAVING clause whose select list is subset of group by columns, gives NPE
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4450
>                 URL: https://issues.apache.org/jira/browse/DERBY-4450
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Dag H. Wanvik
>
> Found this while working on DERBY-4397 for a similar case with ORDER BY inside an IN-subquery:
> Repro:
> create table t(i int not null, constraint c unique (i), j int, k int);
> insert into t values (1,10,1),(2,40,1),(3,45,1),(4,46,1),(5,90,1);
> select sum(j) from t group by i having i in (select i from t group by i,j );
> gives NPE:
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:95)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:87)
> 	at org.apache.derby.impl.jdbc.Util.javaException(Util.java:244)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:398)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java:346)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java:2201)
> 	at org.apache.derby.impl.jdbc.ConnectionChild.handleException(ConnectionChild.java:81)
> 	at org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(EmbedResultSet.java:4338)
> 	at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:467)
> 	at org.apache.derby.impl.jdbc.EmbedResultSet.next(EmbedResultSet.java:371)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:382)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:338)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:241)
> 	at org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:229)
> 	at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:448)
> 	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:522)
> 	at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:363)
> 	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:261)
> 	at org.apache.derby.impl.tools.ij.Main.go(Main.java:229)
> 	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:184)
> 	at org.apache.derby.impl.tools.ij.Main.main(Main.java:75)
> 	at org.apache.derby.tools.ij.main(ij.java:59)
> Caused by: java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:119)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
> 	... 22 more
> Caused by: java.lang.NullPointerException
> 	at org.apache.derby.impl.sql.execute.BaseActivation.getColumnFromRow(BaseActivation.java:1451)
> 	at org.apache.derby.exe.acf81e0010x0125x09b5xf628x000003d4bf801.e5(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.DirectCall.invoke(ReflectGeneratedClass.java:149)
> 	at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(ProjectRestrictResultSet.java:268)
> 	at org.apache.derby.impl.sql.execute.AnyResultSet.getNextRowCore(AnyResultSet.java:171)
> 	at org.apache.derby.exe.acf81e0010x0125x09b5xf628x000003d4bf801.g0(Unknown Source)
> 	at org.apache.derby.exe.acf81e0010x0125x09b5xf628x000003d4bf801.e3(Unknown Source)
> 	at org.apache.derby.impl.services.reflect.DirectCall.invoke(ReflectGeneratedClass.java:145)
> 	at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(ProjectRestrictResultSet.java:268)
> 	at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(BasicNoPutResultSetImpl.java:471)
> 	at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:427)

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