Function ReuseHashTable

src/backend/executor/nodeAgg.c:5227–5237

}

bool
ReuseHashTable(AggState *node)
{
	PlanState  *outerPlan = outerPlanState(node);
	Agg     *aggnode = (Agg *) node->ss.ps.plan;

	return (outerPlan->chgParam == NULL &&
			!node->hash_ever_spilled &&
			!node->streaming &&
			!bms_overlap(node->ss.ps.chgParam, aggnode->aggParams));
}

/*
 * Save statistics into the cdbexplainbuf for EXPLAIN ANALYZE