@Nullable static Boolean getBooleanProperty(Table table, String propertyName) {
    String val = getTableProperty(table, propertyName);
    if (val == null) {
      return null;
    }
    return Boolean.parseBoolean(val);
  }
@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