Bug 416703 Mongodb : Display correctly the Number data type
data/org.eclipse.birt.data.oda.mongodb/src/org/eclipse/birt/data/oda/mongodb/impl/MDbResultSet.java
return getDouble( findFieldName(index) );
	}
	/*
	 * @see org.eclipse.datatools.connectivity.oda.IResultSet#getDouble(java.lang.String)
	 */
	public double getDouble( String columnName ) throws OdaException
	{
        Object columnValue = getFieldValue( columnName );
        columnValue = tryConvertToDataType( columnValue, Double.class );
        if( columnValue instanceof Double )
            return (Double)columnValue;
        if( columnValue instanceof List )
            return (Double)getFirstFieldValue( (List<?>)columnValue, Double.class, columnName );
        
        if( columnValue != null && getLogger().isLoggable( Level.FINE ) )
            getLogger().fine( 
                Messages.bind( "Unable to get double value from the {0} field, whose fetched value is of {1} data type.",  
                        columnName, columnValue.getClass().getSimpleName() ));
        return 0;
    }
	/*
	 * @see org.eclipse.datatools.connectivity.oda.IResultSet#getBigDecimal(int)
	 */
	public BigDecimal getBigDecimal( int index ) throws OdaException
	{
        return getBigDecimal( findFieldName(index) );
	}
	/*
	 * @see org.eclipse.datatools.connectivity.oda.IResultSet#getBigDecimal(java.lang.String)
	 */