code: private String inClause(String field, Set<String> values) {
          String separator = "";
          StringBuffer sb = new StringBuffer(" and (");
          for (String v : values) {
              sb.append(separator);
              sb.append(String.format("%s = '%s'", field, v));
              separator = " or ";
          }
          sb.append(")");
          return sb.toString();
      }
docs: An exploded "in" clause because the actual one seems not to work