tajo-common/src/main/java/org/apache/tajo/datum/Int2Datum.java [216:246]:
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    case INT4:
      return DatumFactory.createInt4(val - datum.asInt4());
    case INT8:
      return DatumFactory.createInt8(val - datum.asInt8());
    case FLOAT4:
      return DatumFactory.createFloat4(val - datum.asFloat4());
    case FLOAT8:
      return DatumFactory.createFloat8(val - datum.asFloat8());
    case NULL_TYPE:
      return datum;
    default:
      throw new InvalidOperationException(datum.type());
    }
  }

  @Override
  public Datum multiply(Datum datum) {
    switch (datum.type()) {
    case INT2:
      return DatumFactory.createInt4(val * datum.asInt2());
    case INT4:
      return DatumFactory.createInt4(val * datum.asInt4());
    case INT8:
      return DatumFactory.createInt8(val * datum.asInt8());
    case FLOAT4:
      return DatumFactory.createFloat4(val * datum.asFloat4());
    case FLOAT8:
      return DatumFactory.createFloat8(val * datum.asFloat8());
    case NULL_TYPE:
      return datum;
    default:
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tajo-common/src/main/java/org/apache/tajo/datum/Int4Datum.java [220:250]:
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    case INT4:
      return DatumFactory.createInt4(val - datum.asInt4());
    case INT8:
      return DatumFactory.createInt8(val - datum.asInt8());
    case FLOAT4:
      return DatumFactory.createFloat4(val - datum.asFloat4());
    case FLOAT8:
      return DatumFactory.createFloat8(val - datum.asFloat8());
    case NULL_TYPE:
      return datum;
    default:
      throw new InvalidOperationException(datum.type());
    }
  }

  @Override
  public Datum multiply(Datum datum) {
    switch (datum.type()) {
    case INT2:
      return DatumFactory.createInt4(val * datum.asInt2());
    case INT4:
      return DatumFactory.createInt4(val * datum.asInt4());
    case INT8:
      return DatumFactory.createInt8(val * datum.asInt8());
    case FLOAT4:
      return DatumFactory.createFloat4(val * datum.asFloat4());
    case FLOAT8:
      return DatumFactory.createFloat8(val * datum.asFloat8());
    case NULL_TYPE:
      return datum;
    default:
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