HashAggTable *
create_agg_hash_table(AggState *aggstate)
{
	……
	HashAggTable *hashtable;
	……
	hashtable = (HashAggTable *) palloc0(sizeof(HashAggTable));
  ……
  uint64 operatorMemKB = PlanStateOperatorMemKB( (PlanState *) aggstate);
  ……
  hashtable->max_mem = 1024.0 * operatorMemKB;
  ……
}