presto-memory-context/src/main/java/io/prestosql/memory/context/AbstractAggregatedMemoryContext.java/AbstractAggregatedMemoryContext/newLocalMemoryContext
class AbstractAggregatedMemoryContext:    @Override
    public LocalMemoryContext newLocalMemoryContext(String allocationTag)
    {
        return new SimpleLocalMemoryContext(this, allocationTag);
    }