[SYSTEMDS-3288] CLA SDC isolated DefaultTuple #1533
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Baunsgaard merged 2 commits intoapache:mainfrom Feb 8, 2022
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This commit change the SDC groups with a default tuple to isolate the default into an array other than the dictionary. This leads to cheep "morphing" between SDC like column groups to improve performance of matrix multiplications and other like operations that benefit from the morphing of column groups to more effecient types. Minor additions (times are for that operation specific improvements) - Improved CLA rexpand (one hot encode) by ~10-50x - BitSet DDC preAggregate to use Bit set operations ~10x - MapToData getCounts specialization ~3x - Full integration of centralMoment (previously extracted MatrixBlock) - Hardening interface for AColGroup, reduce inefficient extractions - Compression time -1 sec for census_enc now ~5.5-6.5 Closes apache#1533
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