Function librocksdb_sys::rocksdb_sstfilewriter_merge

pub unsafe extern "C" fn rocksdb_sstfilewriter_merge(
    writer: *mut rocksdb_sstfilewriter_t,
    key: *const c_char,
    keylen: usize,
    val: *const c_char,
    vallen: usize,
    errptr: *mut *mut c_char
)