Introduce a delta-encoded bitmap #5985
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This PR introduces a new method for reducing the database size. Our first measures found that the size of the word-docids database was reduced by half (yes, 50%) and the word-prefix-docids database was shrunk by 30%.
We will have to introduce a new
DeCboRoaringBitmapthat is capable of deserializing theCboRoaringBitmaps(including the raw number ones), deserializingDeRoaringBitmaps and encoding the numbers asDeRoaringBitmaps. For this, we add a header to the serialization format and also check the size of the serialized data; if it is less than a threshold, it consists of raw u32s.To Do
DeRoaringBitmap.DeCboRoaringBitmapthat manages all encodings.