Crate bitpacking_plus

Extra bitpacking formats

This crate wraps crate bitpacking. It contains variant bitpacking formats, inspired by BPCells.

See also this article

Bitpacking format

The vanilla format

Same as behaviors in vanilla compression of bitpacking.

m1 format

Same as behaviors in vanilla compression of bitpacking, but with 1 subtracted from each value prior to compression.

d1 format

Same as behaviors in delta compression of bitpacking, which transforms the original input into the difference between consecutive values prior to bitpacking. Therefore, the original input block must be sorted.

d1z format

Similar to d1 format but with zigzag encoding applied after difference encoding, where $zigzag(x) = 2x$ if $x > 0$, while $x < 0$, $zigzag(x) = -2x - 1$. This is best for lists of close but not fully sorted runs of integers.

Re-exports

pub use crate::convert::*;

Modules

convert

Helper functions to convert between vanilla array and variants.

Traits

BitPackOps

Wrappers of the orignial bitpacking trait