presto-main/src/main/java/io/prestosql/operator/OperatorContext.java/OperatorContext/localSystemMemoryContext
class OperatorContext:    public LocalMemoryContext localSystemMemoryContext()
    {
        return new InternalLocalMemoryContext(operatorMemoryContext.localSystemMemoryContext(), memoryFuture, this::updatePeakMemoryReservations, false);
    }