presto-main/src/main/java/io/prestosql/sql/planner/StatisticsAggregationPlanner.java/StatisticsAggregationPlanner/StatisticsAggregationPlanner
class StatisticsAggregationPlanner:    public StatisticsAggregationPlanner(SymbolAllocator symbolAllocator, Metadata metadata)
    {
        this.symbolAllocator = requireNonNull(symbolAllocator, "symbolAllocator is null");
        this.metadata = requireNonNull(metadata, "metadata is null");
    }