Readonly
Packed validity bits — ceil(length / 8) bytes.
ceil(length / 8)
Number of cells with their validity bit set. Cached at construction.
Logical row count covered by the bitmap.
Counts defined cells in the half-open range [start, end).
[start, end)
Returns true if the cell at i is defined. Out-of-range → false.
i
Packed validity bits —
ceil(length / 8)bytes.