Github user ebautistabar commented on a diff in the pull request: https://github.com/apache/flink/pull/930#discussion_r35202994 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java --- @@ -580,6 +581,34 @@ public ExecutionContext getExecutionContext() { return result; } + /** + * Returns the a stringified version of the user-defined accumulators. + * @return an Array containing the StringifiedAccumulatorResult objects + */ + public StringifiedAccumulatorResult[] getAccumulatorResultsStringified() { + + Map<String, Accumulator<?, ?>> accumulatorMap = aggregateUserAccumulators(); + + int num = accumulatorMap.size(); + StringifiedAccumulatorResult[] resultStrings = new StringifiedAccumulatorResult[num]; + + int i = 0; + for (Map.Entry<String, Accumulator<?, ?>> entry : accumulatorMap.entrySet()) { + + StringifiedAccumulatorResult result; + Accumulator<?, ?> value = entry.getValue(); + if (value != null) { + result = new StringifiedAccumulatorResult(entry.getKey(), value.getClass().getSimpleName(), value.toString()); + } else { + result = new StringifiedAccumulatorResult(entry.getKey(), "null", "null"); --- End diff -- Why do you use the string `"null"` instead of `null`?
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