presto-main/src/main/java/io/prestosql/operator/OperatorContext.java/InternalAggregatedMemoryContext/close
class InternalAggregatedMemoryContext:        @Override
        public void close()
        {
            if (!closeable) {
                throw new UnsupportedOperationException("Called close on unclosable aggregated memory context");
            }
            delegate.close();
        }