code: private Iterator<Iterable<Row>> deltaQueryAsync(DeltaPlacement placement, Statement statement, boolean singleRow,
                                                      String errorContext, Object... errorContextArgs) {
          return doDeltaQuery(placement, statement, singleRow, true, errorContext, errorContextArgs);
      }
docs: Asynchronously executes the provided statement.  Although the iterator is returned immediately the actual results
  may still be loading in the background.  The statement must query the delta table as returned from
  {@link com.bazaarvoice.emodb.sor.db.astyanax.DeltaPlacement#getDeltaTableDDL()}