Compression PR 2#1589
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This commit adds optimizations to the encoding combination algorithms to allow faster sparse-sparse and sparse-dense combine. [SYSTEMDS-3336] CLA Specialized maps This commit adds a few specializations to maps. MapToZero for all zero mappings. MapToCharPByte for 3 byte mappings (in between char and int). [SYSTEMDS-???] DDCFOR and SDCFOR and Sparsifying compression [SYSTEMDS-???] sparsifying compression general specialization lmm and change cost model for lmm fix cost estimator on unknown dimensions (set to 16) fix sparse TSMM in full rows CSR remove memorizer on Offsets clear soft reference in case of spark compression replace shortcut and compressed multiply cost minimum rows processed more likely to transpose MM binary no decompression fix single col table on compressed colgroup transpose size in memory if compressed is equal to compressed size if no sparse block is allocated allocate a block minor updates
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(just new branch to not force overwrite other commits for safety)
Continue: #1565