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https://issues.apache.org/jira/browse/DERBY-3032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12524774
]
A B commented on DERBY-3032:
----------------------------
Thank you for the patch, Kathey. I verified that it solves the reported
problem and does not affect the performance as seen in DERBY-2986. I also ran
the new test case before and after applying the engine changes, and it behaved
as expected (failed without the fix, passed with it).
> I added comments to try to make it apparent that that is what is happenning,
> but wonder if
> there is better way to reorganize this to make it clearer
I think the comments help (thanks for adding them), but I also agree that some
sort of code reorganization might be good here. The code as it is feels a tad
awkward. Nonetheless, the patch as posted solves the problem so I'm +1 to
commit. If anyone has the time to do some re-org as follow-up work, that'd be
great--but I wouldn't let that block the current patch.
Thank you again for picking this one up and resolving it so quickly.
> java.lang.ClassCastException returning null from a case statement in subquery
> ------------------------------------------------------------------------------
>
> Key: DERBY-3032
> URL: https://issues.apache.org/jira/browse/DERBY-3032
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.3.1.5
> Reporter: Kathey Marsden
> Assignee: Kathey Marsden
> Attachments: derby-3032_diff.txt, derby-3032_stat.txt
>
>
> The following query returning NULL date from a case statement in a subquery
> causees a ClassCastException in 10.3.
> The query works fine in 10.2
> ij> create table t (d date, vc varchar(30));
> 0 rows inserted/updated/deleted
> ij> insert into t values(CURRENT_DATE, 'hello');
> 1 row inserted/updated/deleted
> ij> SELECT d from t where d = (SELECT CASE WHEN 1 = 1 THEN CURRENT_DATE ELSE
> NULL END from t);
> D
> ----------
> 2007-08-28
> 1 row selected
> ij> SELECT d from t where d = (SELECT CASE WHEN 1 = 0 THEN CURRENT_DATE ELSE
> NULL END from t);
> D
> ----------
> ERROR 38000: The exception 'java.lang.ClassCastException:
> org.apache.derby.iapi.types.SQLChar incompatible with org.apac
> he.derby.iapi.types.DateTimeDataValue' was thrown while evaluating an
> expression.
> java.sql.SQLException: The exception 'java.lang.ClassCastException:
> org.apache.derby.iapi.types.SQLChar incompatible wit
> h org.apache.derby.iapi.types.DateTimeDataValue' was thrown while evaluating
> an expression.
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
> at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:88)
> at org.apache.derby.impl.jdbc.Util.seeNextException(Util.java:224)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:398)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java:346)
> at
> org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java:1572)
> at
> org.apache.derby.impl.jdbc.ConnectionChild.handleException(ConnectionChild.java:81)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(EmbedResultSet.java:4323)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:464)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.next(EmbedResultSet.java:368)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:382)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:338)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:241)
> at
> org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:229)
> at
> org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:449)
> at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:523)
> at
> org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:364)
> at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:262)
> at org.apache.derby.impl.tools.ij.Main.go(Main.java:215)
> at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:181)
> at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:56)
> at org.apache.derby.tools.ij.main(ij.java:71)
> Caused by: java.sql.SQLException: Java exception:
> 'org.apache.derby.iapi.types.SQLChar incompatible with org.apache.derb
> y.iapi.types.DateTimeDataValue: java.lang.ClassCastException'.
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
> at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:88)
> at org.apache.derby.impl.jdbc.Util.javaException(Util.java:245)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
> ... 19 more
> Caused by: java.lang.ClassCastException: org.apache.derby.iapi.types.SQLChar
> incompatible with org.apache.derby.iapi.typ
> es.DateTimeDataValue
> at
> org.apache.derby.exe.ac12564092x0114xaec2x9627x0000002183d82.g0(Unknown
> Source)
> at
> org.apache.derby.exe.ac12564092x0114xaec2x9627x0000002183d82.e1(Unknown
> Source)
> at
> org.apache.derby.impl.services.reflect.DirectCall.invoke(ReflectGeneratedClass.java:141)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(ProjectRestrictResultSet.java:267)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(BasicNoPutResultSetImpl.java:468)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:424)
> ... 13 more
> ERROR XJ001: Java exception: 'org.apache.derby.iapi.types.SQLChar
> incompatible with org.apache.derby.iapi.types.DateTime
> DataValue: java.lang.ClassCastException'.
> java.sql.SQLException: Java exception: 'org.apache.derby.iapi.types.SQLChar
> incompatible with org.apache.derby.iapi.type
> s.DateTimeDataValue: java.lang.ClassCastException'.
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
> at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:88)
> at org.apache.derby.impl.jdbc.Util.javaException(Util.java:245)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:398)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java:346)
> at
> org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java:1572)
> at
> org.apache.derby.impl.jdbc.ConnectionChild.handleException(ConnectionChild.java:81)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(EmbedResultSet.java:4323)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:464)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.next(EmbedResultSet.java:368)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:382)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:338)
> at
> org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:241)
> at
> org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:229)
> at
> org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:449)
> at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:523)
> at
> org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:364)
> at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:262)
> at org.apache.derby.impl.tools.ij.Main.go(Main.java:215)
> at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:181)
> at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:56)
> at org.apache.derby.tools.ij.main(ij.java:71)
> Caused by: java.lang.ClassCastException: org.apache.derby.iapi.types.SQLChar
> incompatible with org.apache.derby.iapi.typ
> es.DateTimeDataValue
> at
> org.apache.derby.exe.ac12564092x0114xaec2x9627x0000002183d82.g0(Unknown
> Source)
> at
> org.apache.derby.exe.ac12564092x0114xaec2x9627x0000002183d82.e1(Unknown
> Source)
> at
> org.apache.derby.impl.services.reflect.DirectCall.invoke(ReflectGeneratedClass.java:141)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(ProjectRestrictResultSet.java:267)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(BasicNoPutResultSetImpl.java:468)
> at
> org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(EmbedResultSet.java:424)
> ... 13 more
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