CHANGELOG

All significant changes to this project will be documented in this file.

Unreleased

CountMinSketch now has a type parameter for the count type. Possible values are u8 to u64 and i8 to i64.
HllUnion::get_result is renamed to HllUnion::to_sketch.
update_f32 and update_f64 are removed from ThetaSketch. Use hash_value's wrapper instead.
All sketches are now gated by a feature flag. You need to enable the feature flag to use the sketch. For example, to use CountMinSketch, you need to enable the countmin feature.

New module hash_value provides several value wrappers for matching concrete hashing strategies.
CountMinSketch with unsigned values now supports halve and decay operations.
CpcSketch and CpcUnion are now available for cardinality estimation.
CpcWrapper is now available for reading estimation from a serialized CpcSketch without full deserialization.
FrequentItemsSketch now supports serde for any value implement FrequentItemValue (builtin supports for i64, u64, and String).
Expose codec::SketchBytes, codec::SketchSlice, and FrequentItemValue as public API.
hll::Coupon is now public. You can calculate the coupon and reuse it multiple times avoiding the overhead of hashing multiple times.

This is the initial release. It includes the following sketches: