presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/PushAggregationThroughOuterJoin.java/PushAggregationThroughOuterJoin/groupsOnAllColumns
class PushAggregationThroughOuterJoin:    private static boolean groupsOnAllColumns(AggregationNode node, List<Symbol> columns)
    {
        return new HashSet<>(node.getGroupingKeys()).equals(new HashSet<>(columns));
    }