/// <inheritdoc />
        public virtual string GetMethodChain(CodeHelper code)
        {
            Debug.Assert(code != null, "code is null.");
            Debug.Assert(
                Table != null || _leftKeys.Any() || _rightKeys.Any(),
                "Table is null and _leftKeys and _rightKeys are empty.");

            var builder = new StringBuilder();

            builder.Append(".Map(");
            builder.Append(code.BeginLambda("m"));
            builder.Append("m");

            if (Table != null)
            {
                builder.Append(".ToTable(");
                builder.Append(code.Literal(Table));

                if (Schema != null)
                {
                    builder.Append(", ");
                    builder.Append(code.Literal(Schema));
                }

                builder.Append(")");
            }

            if (_leftKeys.Count != 0)
            {
                builder.Append(".MapLeftKey(");
                builder.Append(code.Literal(_leftKeys));
                builder.Append(")");
            }

            if (_rightKeys.Count != 0)
            {
                builder.Append(".MapRightKey(");
                builder.Append(code.Literal(_rightKeys));
                builder.Append(")");
            }

            builder.Append(")");

            return(builder.ToString());
        }
        /// <inheritdoc />
        public virtual string GetMethodChain(CodeHelper code)
        {
            Debug.Assert(code != null, "code is null.");
            Debug.Assert(
                Table != null || _leftKeys.Any() || _rightKeys.Any(),
                "Table is null and _leftKeys and _rightKeys are empty.");

            var builder = new StringBuilder();
            builder.Append(".Map(");
            builder.Append(code.BeginLambda("m"));
            builder.Append("m");

            if (Table != null)
            {
                builder.Append(".ToTable(");
                builder.Append(code.Literal(Table));

                if (Schema != null)
                {
                    builder.Append(", ");
                    builder.Append(code.Literal(Schema));
                }

                builder.Append(")");
            }

            if (_leftKeys.Count != 0)
            {
                builder.Append(".MapLeftKey(");
                builder.Append(code.Literal(_leftKeys));
                builder.Append(")");
            }

            if (_rightKeys.Count != 0)
            {
                builder.Append(".MapRightKey(");
                builder.Append(code.Literal(_rightKeys));
                builder.Append(")");
            }

            builder.Append(")");

            return builder.ToString();
        }