fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Andrew Kryczka 01bcc34896 Introduce library-independent default compression level ... Summary: Previously we were using -1 as the default for every library, which was legacy from our zlib options. That worked for a while, but after zstd introduced a146ee04ae, it started giving poor compression ratios by default in zstd. This PR adds a constant to RocksDB public API, `CompressionOptions::kDefaultCompressionLevel`, which will get translated to the default value specific to the compression library being used in "util/compression.h". The constant uses a number that appears to be larger than any library's maximum compression level. Closes https://github.com/facebook/rocksdb/pull/3895 Differential Revision: D8125780 Pulled By: ajkr fbshipit-source-id: 2db157a89118cd4f94577c2f4a0a5ff31c8391c6		7 years ago
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rocksdb	Introduce library-independent default compression level	7 years ago