BUG: DatabaseMetaData.getColumns isn't case insensitive

Hello,

I'was trying to get meta data of a column and discovered that the column name is case sensitive though it should be
caseinsensitive. I don't know if this can be somehow determined by a configuration or environment change because I
believethat till recently it  worked in a case-insensitive manner. 

I've the table studna_monitor.mon_user_session with the column "username". The following code wrongly returns null
(notice"username".toUpperCase()): 
---
String col = null;
Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql://localhost/mydb?user=me&password=secret";
Connection conn = DriverManager.getConnection(url);
    DatabaseMetaData databaseMetaData = conn.getMetaData();
    ResultSet columnsMD = databaseMetaData.getColumns(null, "studna_monitor", "mon_user_session",
"username".toUpperCase());
    while(columnsMD.next()) {
        col = columnsMD.getString("COLUMN_NAME");
    }
    return col;
---
While the following returns the column name "username":
---
...
ResultSet columnsMD = databaseMetaData.getColumns(null, "studna_monitor", "mon_user_session",
"username".toLowerCase());
...
---

BTW, the metadata reports:
supportsMixedCaseIdentifiers: false
supportsMixedCaseQuotedIdentifiers: true
(which is pretty much expected)

Driver: postgresql-8.3-604.jdbc3.jar, postgresql-jdbc3-8.2.jar (as distributed with Ubuntu, doesn't provide build
number)
Server:  Postgres 8.2.6 for Solaris


Thank you.
Jakub Holy
maly.velky@email.cz