core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/adaptive/AdaptiveDeltaIntegralCodec.java [124:179]:
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      @Override
      protected void fillLegacyFields(DataChunk2 dataChunk) {
        fillLegacyFieldsIfRequired(dataChunk, result);
      }

    };
  }

  @Override
  public ColumnPageDecoder createDecoder(final ColumnPageEncoderMeta meta) {
    return new ColumnPageDecoder() {
      @Override
      public ColumnPage decode(byte[] input, int offset, int length) {
        ColumnPage page = null;
        if (DataTypes.isDecimal(meta.getSchemaDataType())) {
          page = ColumnPage.decompressDecimalPage(meta, input, offset, length);
        } else {
          page = ColumnPage.decompress(meta, input, offset, length, false, false);
        }
        return LazyColumnPage.newPage(page, converter);
      }

      @Override
      public void decodeAndFillVector(byte[] input, int offset, int length,
          ColumnVectorInfo vectorInfo, BitSet nullBits, boolean isLVEncoded, int pageSize,
          ReusableDataBuffer reusableDataBuffer) {
        Compressor compressor =
            CompressorFactory.getInstance().getCompressor(meta.getCompressorName());
        byte[] unCompressData;
        if (null != reusableDataBuffer && compressor.supportReusableBuffer()) {
          int uncompressedLength = compressor.unCompressedLength(input, offset, length);
          unCompressData = reusableDataBuffer.getDataBuffer(uncompressedLength);
          compressor.rawUncompress(input, offset, length, unCompressData);
        } else {
          unCompressData = compressor.unCompressByte(input, offset, length);
        }
        if (DataTypes.isDecimal(meta.getSchemaDataType())) {
          TableSpec.ColumnSpec columnSpec = meta.getColumnSpec();
          vectorInfo.decimalConverter = DecimalConverterFactory.INSTANCE
              .getDecimalConverter(columnSpec.getPrecision(), columnSpec.getScale());
        }
        converter.decodeAndFillVector(unCompressData, vectorInfo, nullBits, meta.getStoreDataType(),
            pageSize);
      }

      @Override
      public ColumnPage decode(byte[] input, int offset, int length, boolean isLVEncoded) {
        return decode(input, offset, length);
      }
    };
  }

  private ColumnPageValueConverter converter = new ColumnPageValueConverter() {
    @Override
    public void encode(int rowId, byte value) {
      if (targetDataType == DataTypes.BYTE) {
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core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/adaptive/AdaptiveIntegralCodec.java [102:157]:
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      @Override
      protected void fillLegacyFields(DataChunk2 dataChunk) {
        fillLegacyFieldsIfRequired(dataChunk, result);
      }
    };
  }

  @Override
  public ColumnPageDecoder createDecoder(final ColumnPageEncoderMeta meta) {
    return new ColumnPageDecoder() {
      @Override
      public ColumnPage decode(byte[] input, int offset, int length) {
        ColumnPage page = null;
        if (DataTypes.isDecimal(meta.getSchemaDataType())) {
          page = ColumnPage.decompressDecimalPage(meta, input, offset, length);
        } else {
          page = ColumnPage.decompress(meta, input, offset, length, false, false);
        }
        return LazyColumnPage.newPage(page, converter);
      }

      @Override
      public void decodeAndFillVector(byte[] input, int offset, int length,
          ColumnVectorInfo vectorInfo, BitSet nullBits, boolean isLVEncoded, int pageSize,
          ReusableDataBuffer reusableDataBuffer) {
        Compressor compressor =
            CompressorFactory.getInstance().getCompressor(meta.getCompressorName());
        byte[] unCompressData;
        if (null != reusableDataBuffer && compressor.supportReusableBuffer()) {
          int uncompressedLength = compressor.unCompressedLength(input, offset, length);
          unCompressData = reusableDataBuffer.getDataBuffer(uncompressedLength);
          compressor.rawUncompress(input, offset, length, unCompressData);
        } else {
          unCompressData = compressor.unCompressByte(input, offset, length);
        }
        if (DataTypes.isDecimal(meta.getSchemaDataType())) {
          TableSpec.ColumnSpec columnSpec = meta.getColumnSpec();
          vectorInfo.decimalConverter = DecimalConverterFactory.INSTANCE
              .getDecimalConverter(columnSpec.getPrecision(), columnSpec.getScale());
        }
        converter.decodeAndFillVector(unCompressData, vectorInfo, nullBits, meta.getStoreDataType(),
            pageSize);
      }

      @Override
      public ColumnPage decode(byte[] input, int offset, int length, boolean isLVEncoded) {
        return decode(input, offset, length);
      }
    };
  }

  // encoded value = (type cast page value to target data type)
  private ColumnPageValueConverter converter = new ColumnPageValueConverter() {
    @Override
    public void encode(int rowId, byte value) {
      if (targetDataType == DataTypes.BYTE) {
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