presto-memory-context/src/main/java/io/prestosql/memory/context/SimpleLocalMemoryContext.java/SimpleLocalMemoryContext/SimpleLocalMemoryContext
class SimpleLocalMemoryContext:    public SimpleLocalMemoryContext(AggregatedMemoryContext parentMemoryContext, String allocationTag)
    {
        verify(parentMemoryContext instanceof AbstractAggregatedMemoryContext);
        this.parentMemoryContext = (AbstractAggregatedMemoryContext) requireNonNull(parentMemoryContext, "parentMemoryContext is null");
        this.allocationTag = requireNonNull(allocationTag, "allocationTag is null");
    }