presto-spi/src/main/java/io/prestosql/spi/block/RowBlock.java/RowBlock/RowBlock
class RowBlock:    private RowBlock(int startOffset, int positionCount, @Nullable boolean[] rowIsNull, int[] fieldBlockOffsets, Block[] fieldBlocks)
    {
        super(fieldBlocks.length);

        this.startOffset = startOffset;
        this.positionCount = positionCount;
        this.rowIsNull = rowIsNull;
        this.fieldBlockOffsets = fieldBlockOffsets;
        this.fieldBlocks = fieldBlocks;

        this.retainedSizeInBytes = INSTANCE_SIZE + sizeOf(fieldBlockOffsets) + sizeOf(rowIsNull);
    }