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Date: Tue, 6 Nov 2007 21:41:51 -0800 (PST)
From: "Bryan Pendleton (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-3175) NullPointerException on INSERT after
 ALTER TABLE ... DROP COLUMN
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     [ https://issues.apache.org/jira/browse/DERBY-3175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bryan Pendleton updated DERBY-3175:
-----------------------------------

    Attachment: d3175_codeChangeOnly.diff

Attached is d3175_codeChangeOnly.diff, which is not for commit. This change appears to fix the bug. I intend to work up a more complete patch proposal, incorporating Knut's test case as a regression test. I also intend to see whether this code change affects the repro script given in DERBY-3177 and if so I'll link the two issues and include that reproduction script in the regression test as well.

In the meantime, feedback and suggestions about the analysis or the code change are most welcome.


> NullPointerException on INSERT after ALTER TABLE ... DROP COLUMN
> ----------------------------------------------------------------
>
>                 Key: DERBY-3175
>                 URL: https://issues.apache.org/jira/browse/DERBY-3175
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.1.4, 10.4.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Bryan Pendleton
>         Attachments: bug.sql, d3175_codeChangeOnly.diff
>
>
> ij version 10.3
> ij> connect 'jdbc:derby:bugdb;create=true';
> ij> create table t (
>        x varchar(12),
>        y varchar(12),
>        id int primary key generated by default as identity
> );
> 0 rows inserted/updated/deleted
> ij> alter table t drop column y;
> 0 rows inserted/updated/deleted
> ij> insert into t(x) values 'a';
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
>         at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
>         at org.apache.derby.impl.tools.ij.ij.executeImmediate(Unknown Source)
>         at org.apache.derby.impl.tools.ij.utilMain.doCatch(Unknown Source)
>         at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(Unknown Source)
>         at org.apache.derby.impl.tools.ij.utilMain.go(Unknown Source)
>         at org.apache.derby.impl.tools.ij.Main.go(Unknown Source)
>         at org.apache.derby.impl.tools.ij.Main.mainCore(Unknown Source)
>         at org.apache.derby.impl.tools.ij.Main14.main(Unknown Source)
>         at org.apache.derby.tools.ij.main(Unknown Source)
>         at org.apache.derby.iapi.tools.run.main(Unknown Source)
> Caused by: java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
>         ... 18 more
> Caused by: java.lang.NullPointerException
>         at org.apache.derby.impl.sql.compile.ResultColumn.columnTypeAndLengthMatch(Unknown Source)
>         at org.apache.derby.impl.sql.compile.ResultColumnList.columnTypesAndLengthsMatch(Unknown Source)
>         at org.apache.derby.impl.sql.compile.InsertNode.bindStatement(Unknown Source)
>         at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
>         at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
>         at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown Source)
>         ... 11 more

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