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由 Siying Dong 提交于
[Only for Performance Branch] A Hacky patch to lazily generate memtable key for prefix-hashed memtables. Summary: For prefix mem tables, encoding mem table key may be unnecessary if the prefix doesn't have any key. This patch is a little bit hacky but I want to try out the performance gain of removing this lazy initialization. In longer term, we might want to revisit the way we abstract mem tables implementations. Test Plan: make all check Reviewers: haobo, igor, kailiu Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D14265
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