LUCENE-9211 Add compression for Binary doc value fields#1234

Merged

markharwood merged 8 commits intoapache:masterfrom

markharwood:compressedBinDV

Feb 18, 2020

Commits on Feb 18, 2020

Added compression for binary doc values - stores groups of 32 doc values in LZ4 compressed blocks
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Formatting fixes (Thanks, Mike!)
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Addressing review comments (thanks, jpountz!)
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Optimisation - only write one value if all docs share the same length
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Addressing @jpountz review comments - make num docs per chunk part of metadata, remove per-chunk storage of num docs and assume always same number of values. Change doc end pointers to be doc starts.
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Added variously compressible examples of content to tests as per @mikemccand suggestion
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Addressing review comments. Fields made final, initialise blockAddressesStart in CompressedBinaryBlockWriter constructor, serialise shift for number of docs in block,
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Added note to changes.txt
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