I was wondering if the cast exception returning null from a case
statement is expected or a bug. If I cast the NULL to DATE it works ok.
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
