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https://issues.apache.org/jira/browse/DERBY-2008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A B closed DERBY-2008.
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> NullPointerException with LTRIM, RTRIM and 2-argument SUBSTR() call in GROUP
> BY clause.
> ---------------------------------------------------------------------------------------
>
> Key: DERBY-2008
> URL: https://issues.apache.org/jira/browse/DERBY-2008
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.2.1.6, 10.3.0.0
> Reporter: A B
> Assigned To: Yip Ng
> Priority: Minor
> Fix For: 10.2.2.0, 10.3.0.0
>
> Attachments: derby2008-trunk-diff01.txt, derby2008-trunk-stat01.txt
>
>
> The following query, which fails with a syntax error in 10.1.3 (because
> functions are not allowed in a GROUP BY expression for 10.1) fails with a
> NullPointerException in 10.2 and in the codeline (10.3):
> create table dt (vc varchar(30));
> insert into dt values ('1928-09-21'), ('1903-12-08');
> select substr(vc, 3) from dt group by substr(vc, 3);
> Result (on trunk) is:
> java.lang.NullPointerException
> at
> org.apache.derby.impl.sql.compile.TernaryOperatorNode.isEquivalent(TernaryOperatorNode.java:924)
> 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.TernaryOperatorNode.accept(TernaryOperatorNode.java:497)
> 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)
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