Bug 212375 [Automation][Regression]Exception occurs when preview a outputParams["xxx"]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedOdaDSQuery.java
addProperty( odiDSQuery, odaDataSet.getPublicProperties() );
		    addProperty( odiDSQuery, odaDataSet.getPrivateProperties() );
		    odiDSQuery.setParameterHints(
		    		resolveDataSetParameters( false ) );
		    
		    
			prepareOdiQuery( );
			
			assert odiPreparedQuery != null;
	        Collection odiParamsInfo = odiPreparedQuery.getParameterMetaData();
	        if ( odiParamsInfo == null || odiParamsInfo.isEmpty() )
	            return null;
	        
	        
	        
	        ArrayList paramMetaDataList = new ArrayList( odiParamsInfo.size() );
	        Iterator odiParamMDIter = odiParamsInfo.iterator();
	        while ( odiParamMDIter.hasNext() )
	        {
	        	IParameterMetaData odiMetaData = 
	                (IParameterMetaData) odiParamMDIter.next();
	        	ParameterMetaData apiMetaData = new ParameterMetaData( odiMetaData );
	            paramMetaDataList.add( apiMetaData );
	        }
	        return paramMetaDataList;
		}
	}
	
}