protected String rewriteGroupByClause(Query query, GroupByClause groupByClause) { StringBuilder sb = new StringBuilder(); if (groupByClause.getItemCount() > 0) { sb.append(AbstractQueryClause.PREFIX_GROUP_BY); List<GroupByItem> items = groupByClause.getItems(); for (int i = 0; i < items.size(); i++) { GroupByItem item = items.get(i); if (i != 0) { sb.append(AbstractQueryClause.DELIM_COMMA); } sb.append(rewriteGroupByItem(query, item)); } } return sb.toString(); }