/**
   * {@inheritDoc}
   *
   * @throws NullPointerException if {@code rowKey} is {@code null}
   */
  @Override
  public ImmutableMap<C, V> row(R rowKey) {
    checkNotNull(rowKey, "rowKey");
    return MoreObjects.firstNonNull(
        (ImmutableMap<C, V>) rowMap().get(rowKey), ImmutableMap.<C, V>of());
  }

  @Override
  public ImmutableSet<R> rowKeySet() {

    public SortedMap<C, V> subMap(C fromKey, C toKey) {
      checkArgument(rangeContains(checkNotNull(fromKey)) && rangeContains(checkNotNull(toKey)));
      return new TreeRow(rowKey, fromKey, toKey);
    }

    @Override
    public SortedMap<C, V> headMap(C toKey) {
      checkArgument(rangeContains(checkNotNull(toKey)));
      return new TreeRow(rowKey, lowerBound, toKey);
    }

    @Override

    * Send the invoice to the client.
    * Collect the money from the client.
    * Send a notification back to the API user (the external developer), as a callback.
        * At this point is that the API will somehow send a POST request to the
            external API with the notification of the invoice event
            (e.g. "payment successful").
    """
    # Send the invoice, collect the money, send the notification (the callback)

   *
   * @throws IllegalArgumentException if {@code rowKey} is not in {@link #rowKeySet()} or {@code
   *     columnKey} is not in {@link #columnKeySet()}.
   */
  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public V put(R rowKey, C columnKey, @CheckForNull V value) {
    checkNotNull(rowKey);
    checkNotNull(columnKey);
    Integer rowIndex = rowKeyToIndex.get(rowKey);

      return delegate().floorKey(key);
    }

    @Override
    public NavigableMap<K, V> headMap(K toKey, boolean inclusive) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate().headMap(toKey, inclusive);
    }

    @Override
    public SortedMap<K, V> headMap(K toKey) {
      return headMap(toKey, false);
    }

    @Override
    public @Nullable Entry<K, V> higherEntry(K key) {

				joinFieldValues[idx], _ = field.ValueOf(tx.Statement.Context, joinIndexValue)
			}

			if results, ok := joinIdentityMap[utils.ToStringKey(fieldValues...)]; ok {
				joinKey := utils.ToStringKey(joinFieldValues...)
				identityMap[joinKey] = append(identityMap[joinKey], results...)
			}
		}

		_, foreignValues = schema.GetIdentityFieldValuesMap(tx.Statement.Context, joinResults, joinRelForeignFields)
	} else {

    }


    private static byte[] getHmac ( byte[] data, byte[] key ) throws GeneralSecurityException {
        Key macKey = new SecretKeySpec(key.clone(), KerberosConstants.HMAC_ALGORITHM);
        Mac mac = Mac.getInstance(KerberosConstants.HMAC_ALGORITHM);
        mac.init(macKey);
        return mac.doFinal(data);
    }


    public String getUserRealm () {
        return this.userRealm;
    }

			return c, err
		}

		arnKey := p.roleArn
		if p.RolePolicy == "" {
			arnKey = DummyRoleARN
			// Ensure that at most one JWT policy claim based provider may be
			// defined.
			if _, ok := c.arnProviderCfgsMap[DummyRoleARN]; ok {
				return c, errSingleProvider
			}
		}

		c.arnProviderCfgsMap[arnKey] = &p
		c.ProviderCfgs[cfgName] = &p

		{arg: "", wantKey: "", wantValue: ""},
	}
	for _, tt := range tests {
		t.Run(tt.arg, func(t *testing.T) {
			gotKey, gotValue := splitEqual(tt.arg)
			if gotKey != tt.wantKey {
				t.Errorf("splitEqual(%v) got = %v, want %v", tt.arg, gotKey, tt.wantKey)
			}
			if gotValue != tt.wantValue {
				t.Errorf("splitEqual(%v) got1 = %v, want %v", tt.arg, gotValue, tt.wantValue)
			}
		})
	}

                  public Iterable<Entry<Range<Integer>, String>> order(
                      List<Entry<Range<Integer>, String>> insertionOrder) {
                    return Range.<Integer>rangeLexOrdering().onKeys().sortedCopy(insertionOrder);
                  }

                  @SuppressWarnings("unchecked")
                  @Override
                  public Range<Integer>[] createKeyArray(int length) {