How to use

readBlock

method

in

com.facebook.presto.block.BlockSerdeUtil

  @Override
  public Block deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException
  {
    byte[] decoded = Base64.getDecoder().decode(jsonParser.readValueAs(String.class));
    return readBlock(blockEncodingSerde, Slices.wrappedBuffer(decoded));
  }
}

public static Block readBlock(BlockEncodingSerde blockEncodingSerde, Slice slice)
{
  return readBlock(blockEncodingSerde, slice.getInput());
}

static Page readRawPage(int positionCount, SliceInput input, BlockEncodingSerde blockEncodingSerde)
{
  int numberOfBlocks = input.readInt();
  Block[] blocks = new Block[numberOfBlocks];
  for (int i = 0; i < blocks.length; i++) {
    blocks[i] = readBlock(blockEncodingSerde, input);
  }
  return new Page(positionCount, blocks);
}

  @Override
  public Block deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
      throws IOException
  {
    byte[] decoded = Base64.getDecoder().decode(jsonParser.readValueAs(String.class));
    return readBlock(blockEncodingSerde, Slices.wrappedBuffer(decoded));
  }
}

public static Block readBlock(BlockEncodingSerde blockEncodingSerde, Slice slice)
{
  return readBlock(blockEncodingSerde, slice.getInput());
}

  @Override
  protected Page computeNext()
  {
    if (!input.isReadable()) {
      return endOfData();
    }
    int positions = input.readInt();
    int numberOfBlocks = input.readInt();
    Block[] blocks = new Block[numberOfBlocks];
    for (int i = 0; i < blocks.length; i++) {
      blocks[i] = readBlock(serde, input);
    }
    @SuppressWarnings("UnnecessaryLocalVariable")
    Page page = new Page(positions, blocks);
    return page;
  }
}