presto-main/src/main/java/io/prestosql/execution/buffer/PagesSerdeUtil.java/PagesSerdeUtil/readRawPage
class PagesSerdeUtil:    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);
    }