[DERBY-3032] java.lang.ClassCastException returning null from a case statement in subquery

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.3.2.1
• Fix Version/s: 10.3.2.1, 10.4.1.3
• Component/s: SQL
• Bug behavior facts: Regression
• Assignee: Katherine Marsden
• Reporter: Katherine Marsden
• Created: 29/Aug/07 18:26
• Updated: 30/Jun/09 15:55
• Resolved: 04/Sep/07 22:12

Description

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

Issue Links

• is related to: DERBY-2986 Query involving CASE statement significantly slower in 10.3.1.4 than in 10.2.2.0