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Date: Sun, 29 Oct 2006 15:15:18 -0800 (PST)
From: "Yip Ng (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-2014) NullPointerException with NULLIF in
 GROUP BY clause
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     [ http://issues.apache.org/jira/browse/DERBY-2014?page=all ]

Yip Ng updated DERBY-2014:
--------------------------

    Attachment: derby2014-trunk-stat01.txt
                derby2014-trunk-diff01.txt

Attaching patch derby2014-trunk-diff01.txt for DERBY-2014.  Again the NPE happens in isEquivalent() method where it does not handle value is null.  (same symptom as DERBY-2008) and the patch addresses this + additonal testcases.  derbyall + junit suite passes.

> NullPointerException with NULLIF in GROUP BY clause
> ---------------------------------------------------
>
>                 Key: DERBY-2014
>                 URL: http://issues.apache.org/jira/browse/DERBY-2014
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.1.6, 10.3.0.0
>         Environment: Any
>            Reporter: Yip Ng
>         Assigned To: Yip Ng
>         Attachments: derby2014-trunk-diff01.txt, derby2014-trunk-stat01.txt
>
>
> A NPE occurs when NULLIF is used in the GROUP BY clause.
> ij> create table t1 (c1 int);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values 1,2,2,3;
> 4 rows inserted/updated/deleted
> ij> select nullif(c1,c1) from t1 group by nullif(c1,c1);
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> Stacktrace:
> java.lang.NullPointerException
> 	at org.apache.derby.impl.sql.compile.ConstantNode.isEquivalent(ConstantNode.java:285)
> 	at org.apache.derby.impl.sql.compile.CastNode.isEquivalent(CastNode.java:1044)
> 	at org.apache.derby.impl.sql.compile.ConditionalNode.isEquivalent(ConditionalNode.java:518)
> 	at org.apache.derby.impl.sql.compile.GroupByList.findGroupingColumn(GroupByList.java:244)
> 	at org.apache.derby.impl.sql.compile.VerifyAggregateExpressionsVisitor.skipChildren(VerifyAggregateExpressionsVisitor.java:146)
> 	at org.apache.derby.impl.sql.compile.ConditionalNode.accept(ConditionalNode.java:484)
> 	at org.apache.derby.impl.sql.compile.ResultColumn.accept(ResultColumn.java:1515)
> 	at org.apache.derby.impl.sql.compile.QueryTreeNodeVector.accept(QueryTreeNodeVector.java:159)
> 	at org.apache.derby.impl.sql.compile.SelectNode.bindExpressions(SelectNode.java:619)
> 	at org.apache.derby.impl.sql.compile.FromSubquery.bindExpressions(FromSubquery.java:262)
> 	at org.apache.derby.impl.sql.compile.FromList.bindExpressions(FromList.java:337)
> 	at org.apache.derby.impl.sql.compile.SelectNode.bindExpressions(SelectNode.java:500)
> 	at org.apache.derby.impl.sql.compile.DMLStatementNode.bindExpressions(DMLStatementNode.java:249)
> 	at org.apache.derby.impl.sql.compile.DMLStatementNode.bind(DMLStatementNode.java:162)
> 	at org.apache.derby.impl.sql.compile.CursorNode.bind(CursorNode.java:253)
> 	at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:345)
> 	at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:119)
> 	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:745)
> 	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:568)
> 	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:517)
> 	at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:321)
> 	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:517)
> 	at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:370)
> 	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:268)
> 	at org.apache.derby.impl.tools.ij.Main.go(Main.java:204)
> 	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:170)
> 	at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:56)
> 	at org.apache.derby.tools.ij.main(ij.java:71)
> sysinfo:
> ------------------ Java Information ------------------
> Java Version:    1.4.2_12
> Java Vendor:     Sun Microsystems Inc.
> Java home:       C:\jdk142\jre
> Java classpath:  classes;.
> OS name:         Windows XP
> OS architecture: x86
> OS version:      5.1
> Java user name:  yip
> Java user home:  C:\Documents and Settings\Administrator
> Java user dir:   C:\derby\trunk
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.4
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [C:\derby\trunk\classes] 10.3.0.0 alpha - (1)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/United States [en_US]]
> Found support for locale: [de_DE]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [es]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [fr]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [it]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [ja_JP]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [ko_KR]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [pt_BR]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [zh_CN]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [zh_TW]
>          version: 10.3.0.0 alpha - (1)
> ------------------------------------------------------

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