parquet-column/src/main/java/org/apache/parquet/schema/GroupType.java
void membersDisplayString(StringBuilder sb, String indent) {
    for (Type field : fields) {
      field.writeToStringBuilder(sb, indent);
      if (field.isPrimitive()) {
        sb.append(";");
      }
      sb.append("\n");
    }
  }
void membersDisplayString(StringBuilder sb, String indent) {
    for (Type field : fields) {
      field.writeToStringBuilder(sb, indent);
      if (field.isPrimitive()) {
        sb.append(";");
      }
      sb.append("\n");
    }
  }
appends a display string for of the members of this group to sb
@param sb where to append
@param indent the indentation level