src/main/java/org/apache/datasketches/pig/quantiles/DataToItemsSketch.java [155:182]:
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  @Override
  public Schema outputSchema(final Schema input) {
    if (input == null) { return null; }
    try {
      final Schema tupleSchema = new Schema();
      tupleSchema.add(new Schema.FieldSchema("Sketch", DataType.BYTEARRAY));
      return new Schema(new Schema.FieldSchema(getSchemaName(
          this.getClass().getName().toLowerCase(), input), tupleSchema, DataType.TUPLE));
    } catch (final FrontendException e) {
      throw new RuntimeException(e);
    }
  }

  // ACCUMULATOR INTERFACE

  /**
   * An <i>Accumulator</i> version of the standard <i>exec()</i> method. Like <i>exec()</i>,
   * accumulator is called with a bag of Datum Tuples. Unlike <i>exec()</i>, it doesn't serialize the
   * sketch at the end. Instead, it can be called multiple times, each time with another bag of
   * Datum Tuples to be input to the Union.
   *
   * @param inputTuple A tuple containing a single bag, containing Datum Tuples.
   * @see #exec
   * @see "org.apache.pig.Accumulator.accumulate(org.apache.pig.data.Tuple)"
   * @throws IOException by Pig
   */
  @Override
  public void accumulate(final Tuple inputTuple) throws IOException {
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src/main/java/org/apache/datasketches/pig/quantiles/UnionDoublesSketch.java [145:172]:
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  @Override
  public Schema outputSchema(final Schema input) {
    if (input == null) { return null; }
    try {
      final Schema tupleSchema = new Schema();
      tupleSchema.add(new Schema.FieldSchema("Sketch", DataType.BYTEARRAY));
      return new Schema(new Schema.FieldSchema(getSchemaName(
          this.getClass().getName().toLowerCase(), input), tupleSchema, DataType.TUPLE));
    } catch (final FrontendException e) {
      throw new RuntimeException(e);
    }
  }

  //ACCUMULATOR INTERFACE

  /**
   * An <i>Accumulator</i> version of the standard <i>exec()</i> method. Like <i>exec()</i>,
   * accumulator is called with a bag of Sketch Tuples. Unlike <i>exec()</i>, it doesn't serialize the
   * sketch at the end. Instead, it can be called multiple times, each time with another bag of
   * Sketch Tuples to be input to the Union.
   *
   * @param inputTuple A tuple containing a single bag, containing Sketch Tuples.
   * @see #exec
   * @see "org.apache.pig.Accumulator.accumulate(org.apache.pig.data.Tuple)"
   * @throws IOException by Pig
   */
  @Override
  public void accumulate(final Tuple inputTuple) throws IOException {
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