assertTrue(p instanceof AbstractScanPlanNode);
assertNotNull(p.getInlinePlanNode(PlanNodeType.HASHAGGREGATE));
pns = compileToFragments("SELECT F_D1, count(*) as tag FROM RF group by F_D1 order by tag");
p = pns.get(0).getChild(0);
/*/ to debug */ System.out.println("DEBUG: " + p.toExplainPlanString());
assertTrue(p instanceof ProjectionPlanNode);
assertTrue(p.getChild(0) instanceof OrderByPlanNode);
p = p.getChild(0).getChild(0);
assertTrue(p instanceof IndexScanPlanNode);
assertNotNull(p.getInlinePlanNode(PlanNodeType.AGGREGATE));