integration/presto/src/main/prestodb/org/apache/carbondata/presto/readers/DecimalSliceStreamReader.java [45:162]:
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public class DecimalSliceStreamReader extends CarbonColumnVectorImpl
    implements PrestoVectorBlockBuilder {

  private final char[] buffer = new char[100];
  protected int batchSize;
  protected Type type;
  protected BlockBuilder builder;

  public DecimalSliceStreamReader(int batchSize, DataType dataType,
      org.apache.carbondata.core.metadata.datatype.DecimalType decimalDataType) {
    super(batchSize, dataType);
    this.type =
        DecimalType.createDecimalType(decimalDataType.getPrecision(), decimalDataType.getScale());
    this.batchSize = batchSize;
    this.builder = type.createBlockBuilder(null, batchSize);
  }

  @Override
  public Block buildBlock() {
    return builder.build();
  }

  @Override
  public void setBatchSize(int batchSize) {
    this.batchSize = batchSize;
  }

  @Override
  public void putDecimal(int rowId, BigDecimal value, int precision) {
    decimalBlockWriter(value);
  }

  @Override
  public void putDecimals(int rowId, int count, BigDecimal value, int precision) {
    for (int i = 0; i < count; i++) {
      putDecimal(rowId++, value, precision);
    }
  }

  @Override
  public void putNulls(int rowId, int count) {
    for (int i = 0; i < count; i++) {
      builder.appendNull();
    }
  }

  @Override
  public void putNull(int rowId) {
    builder.appendNull();
  }

  @Override
  public void reset() {
    builder = type.createBlockBuilder(null, batchSize);
  }

  private void decimalBlockWriter(BigDecimal value) {
    if (isShortDecimal(type)) {
      long rescaledDecimal = Decimals.rescale(value.unscaledValue().longValue(), value.scale(),
          ((DecimalType) type).getScale());
      type.writeLong(builder, rescaledDecimal);
    } else {
      Slice slice = getSlice(value, type);
      type.writeSlice(builder, parseSlice((DecimalType) type, slice, slice.length()));
    }
  }

  private Slice getSlice(Object value, Type type) {
    if (type instanceof DecimalType) {
      DecimalType actual = (DecimalType) type;
      BigDecimal bigDecimalValue = (BigDecimal) value;
      if (isShortDecimal(type)) {
        return utf8Slice(value.toString());
      } else {
        if (bigDecimalValue.scale() > actual.getScale()) {
          BigInteger unscaledDecimal =
              rescale(bigDecimalValue.unscaledValue(), bigDecimalValue.scale(),
                  bigDecimalValue.scale());
          Slice decimalSlice = Decimals.encodeUnscaledValue(unscaledDecimal);
          return utf8Slice(Decimals.toString(decimalSlice, actual.getScale()));
        } else {
          BigInteger unscaledDecimal =
              rescale(bigDecimalValue.unscaledValue(), bigDecimalValue.scale(), actual.getScale());
          Slice decimalSlice = Decimals.encodeUnscaledValue(unscaledDecimal);
          return utf8Slice(Decimals.toString(decimalSlice, actual.getScale()));
        }
      }
    } else {
      return utf8Slice(value.toString());
    }
  }

  private Slice parseSlice(DecimalType type, Slice slice, int length) {
    BigDecimal decimal = parseBigDecimal(type, slice, length);
    return encodeUnscaledValue(decimal.unscaledValue());
  }

  private BigDecimal parseBigDecimal(DecimalType type, Slice slice, int length) {
    int offset = 0;
    checkArgument(length < buffer.length);
    for (int i = 0; i < length; i++) {
      buffer[i] = (char) slice.getByte(offset + i);
    }
    BigDecimal decimal = new BigDecimal(buffer, 0, length);
    checkState(decimal.scale() <= type.getScale(),
        "Read decimal value scale larger than column scale");
    decimal = decimal.setScale(type.getScale(), HALF_UP);
    checkState(decimal.precision() <= type.getPrecision(),
        "Read decimal precision larger than column precision");
    return decimal;
  }

  @Override
  public void putObject(int rowId, Object value) {
    if (value == null) {
      putNull(rowId);
    } else {
      decimalBlockWriter((BigDecimal) value);
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integration/presto/src/main/prestosql/org/apache/carbondata/presto/readers/DecimalSliceStreamReader.java [45:162]:
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public class DecimalSliceStreamReader extends CarbonColumnVectorImpl
    implements PrestoVectorBlockBuilder {

  private final char[] buffer = new char[100];
  protected int batchSize;
  protected Type type;
  protected BlockBuilder builder;

  public DecimalSliceStreamReader(int batchSize, DataType dataType,
      org.apache.carbondata.core.metadata.datatype.DecimalType decimalDataType) {
    super(batchSize, dataType);
    this.type =
        DecimalType.createDecimalType(decimalDataType.getPrecision(), decimalDataType.getScale());
    this.batchSize = batchSize;
    this.builder = type.createBlockBuilder(null, batchSize);
  }

  @Override
  public Block buildBlock() {
    return builder.build();
  }

  @Override
  public void setBatchSize(int batchSize) {
    this.batchSize = batchSize;
  }

  @Override
  public void putDecimal(int rowId, BigDecimal value, int precision) {
    decimalBlockWriter(value);
  }

  @Override
  public void putDecimals(int rowId, int count, BigDecimal value, int precision) {
    for (int i = 0; i < count; i++) {
      putDecimal(rowId++, value, precision);
    }
  }

  @Override
  public void putNulls(int rowId, int count) {
    for (int i = 0; i < count; i++) {
      builder.appendNull();
    }
  }

  @Override
  public void putNull(int rowId) {
    builder.appendNull();
  }

  @Override
  public void reset() {
    builder = type.createBlockBuilder(null, batchSize);
  }

  private void decimalBlockWriter(BigDecimal value) {
    if (isShortDecimal(type)) {
      long rescaledDecimal = Decimals.rescale(value.unscaledValue().longValue(), value.scale(),
          ((DecimalType) type).getScale());
      type.writeLong(builder, rescaledDecimal);
    } else {
      Slice slice = getSlice(value, type);
      type.writeSlice(builder, parseSlice((DecimalType) type, slice, slice.length()));
    }
  }

  private Slice getSlice(Object value, Type type) {
    if (type instanceof DecimalType) {
      DecimalType actual = (DecimalType) type;
      BigDecimal bigDecimalValue = (BigDecimal) value;
      if (isShortDecimal(type)) {
        return utf8Slice(value.toString());
      } else {
        if (bigDecimalValue.scale() > actual.getScale()) {
          BigInteger unscaledDecimal =
              rescale(bigDecimalValue.unscaledValue(), bigDecimalValue.scale(),
                  bigDecimalValue.scale());
          Slice decimalSlice = Decimals.encodeUnscaledValue(unscaledDecimal);
          return utf8Slice(Decimals.toString(decimalSlice, actual.getScale()));
        } else {
          BigInteger unscaledDecimal =
              rescale(bigDecimalValue.unscaledValue(), bigDecimalValue.scale(), actual.getScale());
          Slice decimalSlice = Decimals.encodeUnscaledValue(unscaledDecimal);
          return utf8Slice(Decimals.toString(decimalSlice, actual.getScale()));
        }
      }
    } else {
      return utf8Slice(value.toString());
    }
  }

  private Slice parseSlice(DecimalType type, Slice slice, int length) {
    BigDecimal decimal = parseBigDecimal(type, slice, length);
    return encodeUnscaledValue(decimal.unscaledValue());
  }

  private BigDecimal parseBigDecimal(DecimalType type, Slice slice, int length) {
    int offset = 0;
    checkArgument(length < buffer.length);
    for (int i = 0; i < length; i++) {
      buffer[i] = (char) slice.getByte(offset + i);
    }
    BigDecimal decimal = new BigDecimal(buffer, 0, length);
    checkState(decimal.scale() <= type.getScale(),
        "Read decimal value scale larger than column scale");
    decimal = decimal.setScale(type.getScale(), HALF_UP);
    checkState(decimal.precision() <= type.getPrecision(),
        "Read decimal precision larger than column precision");
    return decimal;
  }

  @Override
  public void putObject(int rowId, Object value) {
    if (value == null) {
      putNull(rowId);
    } else {
      decimalBlockWriter((BigDecimal) value);
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