plan = attachGrouping(plan, query, aggs, parentOrderBys);
plan = attachGrouping(plan, query, aggs, parentOrderBys);
plan = attachGrouping(plan, query, aggs, parentOrderBys);
plan = attachGrouping(plan, query, aggs, parentOrderBys);
plan = attachGrouping(plan, query, aggs, parentOrderBys);
plan = attachGrouping(plan, query, aggs, parentOrderBys);