tajo-common/src/main/java/org/apache/tajo/datum/Float4Datum.java [114:180]:
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      return val == other.val;
    }

    return false;
  }

  @Override
  public Datum equalsTo(Datum datum) {
    switch (datum.type()) {
      case INT2:
        return DatumFactory.createBool(val == datum.asInt2());
      case INT4:
        return DatumFactory.createBool(val == datum.asInt4());
      case INT8:
        return DatumFactory.createBool(val == datum.asInt8());
      case FLOAT4:
        return DatumFactory.createBool(val == datum.asFloat4());
      case FLOAT8:
        return DatumFactory.createBool(val == datum.asFloat8());
      case NULL_TYPE:
        return datum;
      default:
        throw new InvalidOperationException();
    }
  }

  @Override
  public int compareTo(Datum datum) {
    switch (datum.type()) {
      case INT2: {
        short another = datum.asInt2();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case INT4: {
        int another = datum.asInt4();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case INT8: {
        long another = datum.asInt8();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case FLOAT4: {
        float another = datum.asFloat4();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
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tajo-common/src/main/java/org/apache/tajo/datum/Int8Datum.java [116:182]:
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      return val == other.val;
    }
    
    return false;
  }

  @Override
  public Datum equalsTo(Datum datum) {
    switch (datum.type()) {
      case INT2:
        return DatumFactory.createBool(val == datum.asInt2());
      case INT4:
        return DatumFactory.createBool(val == datum.asInt4());
      case INT8:
        return DatumFactory.createBool(val == datum.asInt8());
      case FLOAT4:
        return DatumFactory.createBool(val == datum.asFloat4());
      case FLOAT8:
        return DatumFactory.createBool(val == datum.asFloat8());
      case NULL_TYPE:
        return datum;
      default:
        throw new InvalidOperationException();
    }
  }

  @Override
  public int compareTo(Datum datum) {
    switch (datum.type()) {
      case INT2: {
        short another = datum.asInt2();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case INT4: {
        int another = datum.asInt4();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case INT8: {
        long another = datum.asInt8();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
        }
      }
      case FLOAT4: {
        float another = datum.asFloat4();
        if (val < another) {
          return -1;
        } else if (val > another) {
          return 1;
        } else {
          return 0;
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