In-Memory Compression, Columnar Compression Techniques
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The following columnar compression techniques are implemented:
- Sparse Storage for columns with lots of NULL values
- Float Storage for scientific data
- Integer Compression with a bit-size approach
- Sequence Compression for sequences of integers like IDs (1, 2, 3, 4, 5 ...)
- Dictionary Compression for short strings
- BLOB Zipping and Deduplication for strings longer than 1KiB
Also, MemCP is able to compress indexes.