Bug 207561 [Regression] Conversion errror when preview the attached report design
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLUtility.java
private static void mergeParameterMetaData( DataSetDesign dataSetDesign,
			IParameterMetaData md ) throws OdaException
	{
		if ( md == null || dataSetDesign == null )
			return;
		DataSetParameters dataSetParameter = DesignSessionUtil.toDataSetParametersDesign( md,
				ParameterMode.IN_LITERAL );
		if ( dataSetParameter != null )
		{
			Iterator iter = dataSetParameter.getParameterDefinitions( )
					.iterator( );
			while ( iter.hasNext( ) )
			{
				ParameterDefinition defn = (ParameterDefinition) iter.next( );
				proccessParamDefn( defn, dataSetParameter );
			}
		}
		dataSetDesign.setParameters( dataSetParameter );
	}
	/**
	 * Process the parameter definition for some special case
	 * 
	 * @param defn
	 * @param parameters
	 */
	private static void proccessParamDefn( ParameterDefinition defn,
			DataSetParameters parameters )
	{
		if ( defn.getAttributes( ).getNativeDataTypeCode( ) == Types.NULL )
		{