public String paramToValues(Map<String, String> parameters) {
    List<String> paramsToValue = new ArrayList<>();
    for (String s : req) {
      String p = parameters.get(s);
      if (p == null) {
        p = "0";
      }
      paramsToValue.add("'" + s + "'='" + p + "'");
    }
    return Joiner.on(",").join(paramsToValue);
  }
Parses the ColumnStatistics for all the columns in a given partition and adds the alter table update
statistics command for each column.

@param columnStatisticsObjList
@param tblName
@param ptName
@param dbName
ql/src/java/org/apache/hadoop/hive/ql/exec/DDLPlanUtils.java