code: @Override
      public CompletableFuture<Void> createSegment(@NonNull String segmentName, Duration timeout) {
          Exceptions.checkNotClosed(this.closed.get(), this);
          val attributes = TableAttributes.DEFAULT_VALUES
                  .entrySet().stream()
                  .map(e -> new AttributeUpdate(e.getKey(), AttributeUpdateType.None, e.getValue()))
                  .collect(Collectors.toList());
          return this.segmentContainer.createStreamSegment(segmentName, attributes, timeout);
      }
docs: region TableStore Implementation