src/main/java/org/apache/datasketches/pig/frequencies/DataToFrequentItemsSketch.java [92:105]:
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  public Tuple exec(final Tuple inputTuple) throws IOException {
    if (this.isFirstCall_) {
      // this is to see in the log which way was used by Pig
      Logger.getLogger(getClass()).info("exec was used");
      this.isFirstCall_ = false;
    }
    if ((inputTuple == null) || (inputTuple.size() == 0)) {
      return null;
    }
    accumulate(inputTuple);
    final Tuple outputTuple = getValue();
    cleanup();
    return outputTuple;
  }
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src/main/java/org/apache/datasketches/pig/frequencies/UnionFrequentItemsSketch.java [55:68]:
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  public Tuple exec(final Tuple inputTuple) throws IOException {
    if (this.isFirstCall_) {
      // this is to see in the log which way was used by Pig
      Logger.getLogger(getClass()).info("exec is used");
      this.isFirstCall_ = false;
    }
    if ((inputTuple == null) || (inputTuple.size() == 0)) {
      return null;
    }
    accumulate(inputTuple);
    final Tuple outputTuple = getValue();
    cleanup();
    return outputTuple;
  }
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