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[FLINK-3485] implement toString for SerializedListAccumulator #1717

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[FLINK-3485] implement toString for SerializedListAccumulator #1717

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11 changes: 8 additions & 3 deletions ...ore/src/main/java/org/apache/flink/api/common/accumulators/SerializedListAccumulator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,14 +42,14 @@ public class SerializedListAccumulator<T> implements Accumulator<T, ArrayList<by

private static final long serialVersionUID = 1L;

private ArrayList<byte[]> localValue = new ArrayList<byte[]>();
private ArrayList<byte[]> localValue = new ArrayList<>();


@Override
public void add(T value) {
throw new UnsupportedOperationException();
}

public void add(T value, TypeSerializer<T> serializer) throws IOException {
try {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
Expand Down Expand Up @@ -97,4 +97,9 @@ public static <T> List<T> deserializeList(ArrayList<byte[]> data, TypeSerializer
}
return result;
}

@Override
public String toString() {
return "SerializedListAccumulator: " + localValue.size() + " elements)";
}
}