Bug 202038 errors occurred when preview the attached design file.
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/FeaturesTest.java
ParameterDefinition inputParamDefn = new ParameterDefinition( "param1",
				DataType.DECIMAL_TYPE );
		inputParamDefn.setInputMode( true );
		inputParamDefn.setDefaultInputValue( "123" );
		inputParamDefn.setPosition( 1 );
		( (OdaDataSetDesign) this.dataSet ).addParameter( inputParamDefn );
		QueryDefinition queryDefn = newReportQuery( );
		IPreparedQuery preparedQuery = dataEngine.prepare( queryDefn );
		Collection parameterMetaData = preparedQuery.getParameterMetaData( );
		assertTrue( parameterMetaData != null && parameterMetaData.size( ) == 1 );
		Iterator iter = parameterMetaData.iterator( );
		while ( iter.hasNext( ) )
		{
			IParameterMetaData paramMd = (IParameterMetaData) iter.next( );
			assertEquals( 1, paramMd.getPosition( ) );
			assertEquals( DataType.STRING_TYPE, paramMd.getDataType( ) );
			assertEquals( "param1", paramMd.getName( ) );
			assertEquals( "VARCHAR", paramMd.getNativeTypeName( ) );
			assertEquals( 0, paramMd.getScale( ) );
			assertEquals( 10, paramMd.getPrecision( ) );
			assertEquals( "123", paramMd.getDefaultInputValue( ) );
		}
	}
	
	/**
	 * Test feature of
	 * 		NativeColumnTypeName
	 * @throws Exception
	 */
	public void testNativeColumnTypeName() throws Exception