src/main/java/org/apache/datasketches/pig/quantiles/DataToItemsSketch.java [156:166]:
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  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);
    }
  }
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src/main/java/org/apache/datasketches/pig/quantiles/UnionItemsSketch.java [142:152]:
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  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);
    }
  }
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src/main/java/org/apache/datasketches/pig/quantiles/UnionDoublesSketch.java [146:156]:
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  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);
    }
  }
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