presto-spi/src/main/java/io/prestosql/spi/block/SingleRowBlockEncoding.java/SingleRowBlockEncoding/readBlock
class SingleRowBlockEncoding:    @Override
    public Block readBlock(BlockEncodingSerde blockEncodingSerde, SliceInput sliceInput)
    {
        int numFields = sliceInput.readInt();
        Block[] fieldBlocks = new Block[numFields];
        for (int i = 0; i < fieldBlocks.length; i++) {
            fieldBlocks[i] = blockEncodingSerde.readBlock(sliceInput);
        }
        return new SingleRowBlock(0, fieldBlocks);
    }