code: @Initialize(distributed = false)
      public void truncateIfNecesary() {
          if (truncateTable) {
              final UpdateableDatastoreConnection con = datastore.openConnection();
              try {
                  final SchemaNavigator schemaNavigator = con.getSchemaNavigator();
  
                  final Table table = schemaNavigator.convertToTable(schemaName, tableName);
  
                  final UpdateableDataContext dc = con.getUpdateableDataContext();
                  dc.executeUpdate(new UpdateScript() {
                      @Override
                      public void run(UpdateCallback callback) {
                          final RowDeletionBuilder delete = callback.deleteFrom(table);
                          if (logger.isInfoEnabled()) {
                              logger.info("Executing truncating DELETE operation: {}", delete.toSql());
                          }
                          delete.execute();
                      }
                  });
              } finally {
                  con.close();
              }
          }
      }
docs: Truncates the database table if necesary. This is NOT a distributable
  initializer, since it can only happen once.