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();
}
