NullPointerException at ResultSet.close() time for simple query using UNION and
INTERSECT
-----------------------------------------------------------------------------------------
Key: DERBY-939
URL: http://issues.apache.org/jira/browse/DERBY-939
Project: Derby
Type: Bug
Versions: 10.2.0.0
Environment: Derby 10.2 trunk -- embedded and server modes
Reporter: A B
If I attempt to execute the following simple query using UNION and INTERSECT,
Derby will return the correct results and then, _after_ returning the results,
will throw a NullPointerException. This error does *NOT* occur for Derby 10.1,
hence I'm marking it as "Major" since it seems like a regression.
348600
To reproduce:
create table t1 (i int);
create table t2 (j int);
create table t3 (a int);
ij> select i from t1 union (select j from t2 intersect select a from t3);
1
-----------
0 rows selected
ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
If I add data, the query will return the correct results, but then throw the
NPE.
insert into t1 values 1, 2, 3, 4, 5;
insert into t2 values 2, 4, 6, 8, 10;
insert into t3 values 2, 3, 4;
ij> select i from t1 union (select j from t2 intersect select a from t3);
1
-----------
1
2
3
4
5
5 rows selected
ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
The embedded and client stack traces are shown below. Both suggest that the
problem occurs during the close of the result set.
-- Embedded --
java.lang.NullPointerException
at
org.apache.derby.impl.sql.execute.rts.RealUnionResultSetStatistics.getStatementExecutionPlanText(RealUnionResultSetStatistics.java:107)
at
org.apache.derby.impl.sql.execute.rts.RealSortStatistics.getStatementExecutionPlanText(RealSortStatistics.java:124)
at
org.apache.derby.impl.sql.execute.rts.RunTimeStatisticsImpl.getStatementExecutionPlanText(RunTimeStatisticsImpl.java:293)
at
org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.finishAndRTS(BasicNoPutResultSetImpl.java:633)
at
org.apache.derby.impl.sql.execute.SortResultSet.finish(SortResultSet.java:479)
at
org.apache.derby.impl.jdbc.EmbedResultSet.close(EmbedResultSet.java:533)
at
org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:272)
at
org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:260)
at
org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:381)
at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:434)
at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:55)
at org.apache.derby.tools.ij.main(ij.java:60)
-- Client --
We get an "actual code point does not match expected code point", but further
down the stack is the NPE:
ERROR XJ001: DERBY SQL error: SQLCODE: -1, SQLSTATE: XJ001, SQLERRMC:
java.lang.NullPointerException
¶¶XJ001.U
java.sql.SQLException: DERBY SQL error: SQLCODE: -1, SQLSTATE: XJ001, SQLERRMC:
java.lang.NullPointerException¶¶XJ001.U
at
org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:280)
at
org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:295)
at org.apache.derby.client.am.ResultSet.close(ResultSet.java:412)
at
org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:272)
at
org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:260)
at
org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:381)
at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:434)
at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:55)
at org.apache.derby.tools.ij.main(ij.java:60)
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