Module filter 

Filter support with bitsets and filter-aware widening.

Structs

BitsetFilter

Bitset filter for vector IDs

Functions

apply_tombstones

Combine a tombstone bitset with a filter

compute_widening_factor

Compute filter-aware widening factor If selectivity is s, we need ~1/s more candidates before filtering

widen_for_filter

Apply filter-aware widening to candidate count