@Override
  public Array createArrayOf(String arg0, Object[] arg1) throws SQLException {
    // TODO Auto-generated method stub
    throw new SQLFeatureNotSupportedException("Method not supported");
  }
Lookup varName in sessConfMap, if its null or empty return the default
value varDefault
@param varName
@param varDefault
@return
jdbc/src/java/org/apache/hive/jdbc/HiveConnection.java