joinQueryTransformer = new JoinQueryTransformer();
// select the column associated to the selected level into the selected hierarchy
String aggColumnName = datamartProvider.getSelectedLevel().getColumnId();
joinQueryTransformer.addSelectColumn(aggColumnName);
// select all columns defined as measure in the metadata configuration block
it = measureColumnNames.iterator();
while(it.hasNext()) {
String measureColumnName= (String)it.next();