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[DNM] cache: add block cache for table #185

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@wangnengjie wangnengjie commented Jul 25, 2022

DO NOT MERGE!
This is just an example impl for block cache. The design of LRU is copied from leveldb. (I'm a Rust beginner. So the code is quite ugly.)
Currently, as agatedb opens every table in mmap mode, the block cache is nearly useless.(sorry I misunderstand mmap)
I'll add some test for block cache later.
relate issues:
#153
#164

Signed-off-by: wangnengjie <[email protected]>
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