parquet-pig/src/main/java/org/apache/parquet/pig/summary/Summary.java
private static TupleSummaryData merge(Tuple t) throws IOException {
    TupleSummaryData summaryData = new TupleSummaryData();
    DataBag bag = (DataBag) t.get(0);
    for (Tuple tuple : bag) {
      summaryData.merge(getData(tuple));
    }
    return summaryData;
  }
private static TupleSummaryData merge(Tuple t) throws IOException {
    TupleSummaryData summaryData = new TupleSummaryData();
    DataBag bag = (DataBag) t.get(0);
    for (Tuple tuple : bag) {
      summaryData.merge(getData(tuple));
    }
    return summaryData;
  }
the input tuple contains a bag of string representations of TupleSummaryData

@param t
@return
@throws ExecException
@throws JsonParseException
@throws JsonMappingException
@throws IOException