code: private String setSelectQuery(List<String> columns) {
          if (columns != null && !columns.isEmpty()) {
              return CQLTranslator.SELECT_QUERY;
          }
          if (kunderaQuery.isAggregated()) {
              Expression selectExpression =
                  ((SelectClause) kunderaQuery.getSelectStatement().getSelectClause()).getSelectExpression();
              // create query depending on function
              if (selectExpression instanceof CountFunction) {
                  return CQLTranslator.SELECT_COUNT_QUERY;
              }
          }
          return CQLTranslator.SELECTALL_QUERY;
      }
docs: Sets the select query.
  
  @param columns
  the columns
  @return the string