NullPointerException with NULLIF in GROUP BY clause

• Key: DERBY-2014
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Major
• Assignee: Yip Ng
• Reporter: Yip Ng
• Component/s: SQL
• Affects Version/s: 10.2.1.6, 10.3.1.4
• Fix Version/s: 10.2.2.0, 10.3.1.4

Description

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)
------------------------------------------------------