@Override
    public String toString() {
        StringBuilder b = new StringBuilder();
        b.append('{');
        for (int i = 0; i < this.fields.length; i++) {
            b.append(this.fields[i].toString());
            if (i < this.fields.length - 1)
                b.append(',');
        }
        b.append("}");
        return b.toString();
    }
Display a string representation of the schema
clients/src/main/java/org/apache/kafka/common/protocol/types/Schema.java