.executeOnCollections(input1, input2, ctx, executionConfig); executionConfig.enableObjectReuse(); List<Tuple2<String, Integer>> resultRegular = getCoGroupOperator(udf2) .executeOnCollections(input1, input2, ctx, executionConfig); .executeOnCollections(Collections.<Tuple2<String, Integer>>emptyList(), Collections.<Tuple2<String, Integer>>emptyList(), ctx, executionConfig); .executeOnCollections(Collections.<Tuple2<String, Integer>>emptyList(), Collections.<Tuple2<String, Integer>>emptyList(), ctx, executionConfig);