code: protected Object loadOneValue(String attrName, BackedSession sess) {
          Object value = null;
          if (_smc.isUsingMultirow() && !((DatabaseSession)sess).getPopulatedAppData()) { //PM90293
              value = getValue(attrName, sess);
          }
          return value;
      }
docs: /*
  loadOneValue
  For multirow db, attempts to get the requested attr from the db
  Returns null if attr doesn't exist or we're not running multirow
  After PM90293, we consider populatedAppData as well
  populatedAppData is true when session is new or when the entire session is read into memory
  in those cases, we don't want to go to the backend to retrieve the attribute