src/main/java/org/apache/datasketches/pig/sampling/VarOptCommonImpl.java [149:165]:
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      this.targetK_ = Integer.parseInt(kStr);
      this.weightIdx_ = Integer.parseInt(weightIdxStr);

      if (this.targetK_ < 1) {
        throw new IllegalArgumentException("VarOptSampling requires target sample size >= 1: "
                + this.targetK_);
      }
      if (this.weightIdx_ < 0) {
        throw new IllegalArgumentException("VarOptSampling requires weight index >= 0: "
                + this.weightIdx_);
      }
    }

    @Override
    public Tuple exec(final Tuple inputTuple) throws IOException {
      if (inputTuple == null || inputTuple.size() < 1 || inputTuple.isNull(0)) {
        return null;
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src/main/java/org/apache/datasketches/pig/sampling/VarOptCommonImpl.java [205:221]:
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      this.targetK_ = Integer.parseInt(kStr);
      this.weightIdx_ = Integer.parseInt(weightIdxStr);

      if (this.targetK_ < 1) {
        throw new IllegalArgumentException("VarOptSampling requires target sample size >= 1: "
                + this.targetK_);
      }
      if (this.weightIdx_ < 0) {
        throw new IllegalArgumentException("VarOptSampling requires weight index >= 0: "
                + this.weightIdx_);
      }
    }

    @Override
    public Tuple exec(final Tuple inputTuple) throws IOException {
      if (inputTuple == null || inputTuple.size() < 1 || inputTuple.isNull(0)) {
        return null;
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