code: public String getQuery(String changeDatePara, String queryName) {
          ST st = (new STGroupDir(featureSettings.getQueryFolder(), '$', '$')).getInstanceOf(queryName);
          st.add("changeDate", changeDatePara);
          return st.render();
      }
docs: Retrieves source system queries based on the query name (without the file
  type) and a specified change date parameter.
  
  @param changeDatePara
  The change date specified from which to pull data with a given
  query template.
  @param queryName
  The source system query name (without the file type).
  @return A given source system query, in String format.