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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3872) NullPoinerException thrown when INTEGER function used as a predicate in a WHERE clause of a SELECT .. GROUP BY .. HAVING statement
Date Wed, 15 Oct 2008 20:46:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639959#action_12639959
] 

Mamta A. Satoor commented on DERBY-3872:
----------------------------------------

Committed the fix for this jira entry into trunk with revision 705037 with following commit
comments.

DERBY-3872

The NPE in this jira entry was caused by the missing overwrite of accept() method in IndexToBaseRowNode.
Because of the missing code, the additional layer of VirtualColumn node over ResultColumn
was not 
happening for the where clause in HAVING. Once the accept method was added to IndexToBaseRowNode,
the
VirtualColumn on top of the ResultColumn got the correct resultset number associated with
it and at the
code generation time, we start referencing the correct resultset rather than the one associated
with
the JOIN clause. Thanks a ton to Army and Bryan on this jira entry for their help.

I have added a test case for this in lang/GroupByTest.java

> NullPoinerException thrown when INTEGER function used as a predicate in a WHERE clause
of a SELECT .. GROUP BY ..  HAVING statement
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3872
>                 URL: https://issues.apache.org/jira/browse/DERBY-3872
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.3.3.0
>            Reporter: Stan Bradbury
>            Assignee: Mamta A. Satoor
>         Attachments: armysFix.diff, NPE_Reproduction.sql, QueryWithoutTruePred.out, QueryWithTruePred.out
>
>
> Use attached SQL script to create two tables , execute the following SQL and throw the
exception and stack trace below.  NOTE:  removing the 'always true' clause '.. ( integer (1.1)
= 1) .." from the SQL and the query does not fail.  Releated??
> select  q1."DEPTNO" from DEPTTAB q1, EMPTAB q2 where  ( integer (1.1) = 1)  and  ( q2."DEPT_DEPTNO"
=  q1."DEPTNO")  
> GROUP BY q1."DEPTNO" 
> HAVING  max( q2."SALARY") >=  ( select  q3."SALARY" from EMPTAB q3 where  ( q3."EMPID"
=  q1."DEPTNO") ) 
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while evaluating
an expression.
> . . .derby.iapi.error.StandardException.newException
> . . .derby.iapi.error.StandardException.unexpectedUserException
> . . .derby.impl.services.reflect.DirectCall.invoke
> . . .derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore
> . . .derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow
> . . .derby.impl.jdbc.EmbedResultSet.movePosition
> . . .derby.impl.jdbc.EmbedResultSet.next
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.DisplayResults
> . . .derby.impl.tools.ij.utilMain.displayResult
> . . .derby.impl.tools.ij.utilMain.doCatch
> . . .derby.impl.tools.ij.utilMain.runScriptGuts
> . . .derby.impl.tools.ij.utilMain.go
> . . .derby.impl.tools.ij.Main.go
> . . .derby.impl.tools.ij.Main.mainCore
> . . .derby.impl.tools.ij.Main14.main
> . . .derby.tools.ij.main
> Caused by: java.lang.NullPointerException
> . . .derby.iapi.types.NumberDataType.compare
> . . .derby.impl.store.access.btree.ControlRow.compareIndexRowFromPageToKey
> . . .derby.impl.store.access.btree.ControlRow.searchForEntry
> . . .derby.impl.store.access.btree.LeafControlRow.search
> . . .derby.impl.store.access.btree.BTreeScan.positionAtStartForForwardScan
> . . .derby.impl.store.access.btree.BTreeForwardScan.positionAtStartPosition
> . . .derby.impl.store.access.btree.BTreeForwardScan.fetchRows
> . . .derby.impl.store.access.btree.BTreeScan.fetchNext
> . . .derby.impl.sql.execute.TableScanResultSet.getNextRowCore
> . . .derby.impl.sql.execute.IndexRowToBaseRowResultSet.getNextRowCore
> . . .derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore
> . . .derby.impl.sql.execute.OnceResultSet.getNextRowCore
> . . .derby.exe.ac601a400fx011cx480cx5eacx00000010d8100.g0
> . . .derby.exe.ac601a400fx011cx480cx5eacx00000010d8100.e6
> 	... 17 more
> ============= begin nested exception, level (1) ===========
> java.lang.NullPointerException
> . . .derby.iapi.types.NumberDataType.compare
> . . .derby.impl.store.access.btree.ControlRow.compareIndexRowFromPageToKey
> . . .derby.impl.store.access.btree.ControlRow.searchForEntry
> . . .derby.impl.store.access.btree.LeafControlRow.search
> . . .derby.impl.store.access.btree.BTreeScan.positionAtStartForForwardScan
> . . .derby.impl.store.access.btree.BTreeForwardScan.positionAtStartPosition
> . . .derby.impl.store.access.btree.BTreeForwardScan.fetchRows
> . . .derby.impl.store.access.btree.BTreeScan.fetchNext
> . . .derby.impl.sql.execute.TableScanResultSet.getNextRowCore
> . . .derby.impl.sql.execute.IndexRowToBaseRowResultSet.getNextRowCore
> . . .derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore
> . . .derby.impl.sql.execute.OnceResultSet.getNextRowCore
> . . .derby.exe.ac601a400fx011cx480cx5eacx00000010d8100.g0
> . . .derby.exe.ac601a400fx011cx480cx5eacx00000010d8100.e6
> . . .derby.impl.services.reflect.DirectCall.invoke
> . . .derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore
> . . .derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow
> . . .derby.impl.jdbc.EmbedResultSet.movePosition
> . . .derby.impl.jdbc.EmbedResultSet.next
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.indent_DisplayResults
> . . .derby.tools.JDBCDisplayUtil.DisplayResults
> . . .derby.impl.tools.ij.utilMain.displayResult
> . . .derby.impl.tools.ij.utilMain.doCatch
> . . .derby.impl.tools.ij.utilMain.runScriptGuts
> . . .derby.impl.tools.ij.utilMain.go
> . . .derby.impl.tools.ij.Main.go
> . . .derby.impl.tools.ij.Main.mainCore
> . . .derby.impl.tools.ij.Main14.main
> . . .derby.tools.ij.main
> ============= end nested exception, level (1) ===========
> Cleanup action completed

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