/// <summary>
        ///     <para>
        ///         Creates a human-readable representation of the given metadata.
        ///     </para>
        ///     <para>
        ///         Warning: Do not rely on the format of the returned string.
        ///         It is designed for debugging only and may change arbitrarily between releases.
        ///     </para>
        /// </summary>
        /// <param name="index"> The metadata item. </param>
        /// <param name="options"> Options for generating the string. </param>
        /// <param name="indent"> The number of indent spaces to use before each new line. </param>
        /// <returns> A human-readable representation. </returns>
        public static string ToDebugString(
            [NotNull] this ITableIndex index,
            MetadataDebugStringOptions options,
            int indent = 0)
        {
            var builder      = new StringBuilder();
            var indentString = new string(' ', indent);

            builder.Append(indentString);
            var singleLine = (options & MetadataDebugStringOptions.SingleLine) != 0;

            if (singleLine)
            {
                builder.Append("Index: ");
            }

            builder
            .Append(index.Name)
            .Append(" ")
            .Append(ColumnBase.Format(index.Columns));

            if (index.IsUnique)
            {
                builder
                .Append(" Unique");
            }

            if (!string.IsNullOrWhiteSpace(index.Filter))
            {
                builder
                .Append(" Filtered");
            }

            if (!singleLine &&
                (options & MetadataDebugStringOptions.IncludeAnnotations) != 0)
            {
                builder.Append(index.AnnotationsToDebugString(indent + 2));
            }

            return(builder.ToString());
        }