Commits on Sep 6, 2022

1. Improve String Last/First Storage Efficiency …

   -Add classes for writing cell values in LZ4 block compressed format.
   Payloads are indexed by element number for efficient random lookup
   -update SerializablePairLongStringComplexMetricSerde to use block
   compression
   -SerializablePairLongStringComplexMetricSerde also uses delta encoding
   of the Long by doing 2-pass encoding: buffers first to find min/max
   numbers and delta-encodes as integers if possible
   
   Entry points for doing block-compressed storage of byte[] payloads
   are the CellWriter and CellReader class. See
   SerializablePairLongStringComplexMetricSerde for how these are used
   along with how to do full column-based storage (delta encoding here)
   which includes 2-pass encoding to compute a column header

   

   rash67 committed Sep 6, 2022
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