MONDRIAN: Fix DB2/NT v7.1 JDBC DatabaseMetaData#getColumns return isNullable as null. (Unbelievable! Don't JDBC driver implementors read the spec?) (Check in on behalf of Gang Chen.)
MONDRIAN: Fix DB2/NT v7.1 JDBC DatabaseMetaData#getColumns return isNullable as null. (Unbelievable! Don't JDBC driver implementors read the spec?) (Check in on behalf of Gang Chen.)

[git-p4: depot-paths = "//open/mondrian/": change = 4805]

inevo/mondrian,inevo/mondrian