WriteBatch::Put() overload that gathers key and value from arrays of slices
Summary: In our project, when writing to the database, we want to form the value as the concatenation of a small header and a larger payload. It's a shame to have to copy the payload just so we can give RocksDB API a linear view of the value. Since RocksDB makes a copy internally, it's easy to support gather writes. Test Plan: write_batch_test, new test case Reviewers: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D13947
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