Function librocksdbsys::crocksdb_writebatch_merge_cf

pub unsafe extern "C" fn crocksdb_writebatch_merge_cf(
    batch: *mut DBWriteBatch, 
    cf: *mut DBCFHandle, 
    key: *const u8, 
    klen: size_t, 
    val: *const u8, 
    vlen: size_t
)