@Nullable public static List<String> getListProperty(Table table, String propertyName) {
    List<String> rv = new ArrayList<>();
    String values = getTableProperty(table, propertyName);
    if (values == null) {
      return null;
    }
    String[] vals = values.trim().split(",");
    for (String val : vals) {
      if (org.apache.commons.lang3.StringUtils.isNotBlank(val)) {
        rv.add(val);
      }
    }
    return rv;
  }
@param pushedSegment         the pushed data segment object
@param segmentsDescriptorDir actual directory path for descriptors.
@return a sanitize file name
druid-handler/src/java/org/apache/hadoop/hive/druid/DruidStorageHandlerUtils.java