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

Adam Retter 62dec0e2b7 RemoveEmptyValueCompactionFilter - A compaction filter which removes entries which have an empty value		10 years ago
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remove_emptyvalue_compactionfilter.cc	RemoveEmptyValueCompactionFilter - A compaction filter which removes entries which have an empty value	10 years ago
remove_emptyvalue_compactionfilter.h	RemoveEmptyValueCompactionFilter - A compaction filter which removes entries which have an empty value	10 years ago