Exception while doing ResultSetMetadata.getColumnName() after select setval()

jdbc driver: postgresql-8.1-410.jdbc3.jar
Sun jdk 1.6.0_01 windows xp
postgresql 8.1.5 on windows xp and postgresql 8.1.9 on ubuntu

Came across what looks like a bug in the driver when I wanted to realign
sequences.

Works fine when I inject everything from pgadmin, but I have a java code
that insert every statement one by one and the 'verification' done by
the code throws up an exception.

sql is typically:

create table mytable ( serial id ... );
insert table (id, ...) values (101, ...);
..

-- this lines blows up with exception
select setval ('mytable_id', max(id)) from mytable;

It works fine if I wrap the select around another select ie something
like this:

select 1 from (select setval ('mytable_id', max(id)) from mytable) as
workaround;

Stacktrace is:
org.postgresql.util.PSQLException: The column index is out of range: 0,
number of columns: 1. at
org.postgresql.jdbc2.AbstractJdbc2ResultSetMetaData.getField(AbstractJdbc2ResultSetMetaData.java:639)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSetMetaData.getColumnLabel(AbstractJdbc2ResultSetMetaData.java:279)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSetMetaData.getColumnName(AbstractJdbc2ResultSetMetaData.java:294)
at com.ibatis.common.jdbc.ScriptRunner.runScript(ScriptRunner.java:175)
at com.ibatis.common.jdbc.ScriptRunner.runScript(ScriptRunner.java:107)

The code in iBatis does (see XXX note for line 175 reference) :

[...]
Statement statement = conn.createStatement();

println(command);

boolean hasResults = false;
if (stopOnError) {
hasResults = statement.execute(command.toString());
} else {
try {
statement.execute(command.toString());
} catch (SQLException e) {
e.fillInStackTrace();
printlnError("Error executing: " + command);
printlnError(e);
}
}

if (autoCommit && !conn.getAutoCommit()) {
conn.commit();
}

ResultSet rs = statement.getResultSet();
if (hasResults && rs != null) {
ResultSetMetaData md = rs.getMetaData();
int cols = md.getColumnCount();
for (int i = 0; i < cols; i++) {
String name = md.getColumnName(i); // XXX Exception here
print(name + "\t");
}
println("");
while (rs.next()) {
for (int i = 0; i < cols; i++) {
String value = rs.getString(i);
print(value + "\t");
}
println("");
}
}

command = null;
try {
statement.close();
} catch (Exception e) {
// Ignore to workaround a bug in Jakarta DBCP
}
[...]

cheers,

-- stephane