[fix](load) fix priority queue order in memtable memory limiter

be/src/olap/memtable_memory_limiter.cpp

@@ -160,7 +160,7 @@ void MemTableMemoryLimiter::_flush_active_memtables(int64_t need_flush) {
  }
 
  using WriterMem = std::pair<std::weak_ptr<MemTableWriter>, int64_t>;
- auto cmp = [](WriterMem left, WriterMem right) { return left.second > right.second; };
+ auto cmp = [](WriterMem left, WriterMem right) { return left.second < right.second; };
  std::priority_queue<WriterMem, std::vector<WriterMem>, decltype(cmp)> heap(cmp);
 
  for (auto writer : _active_writers) {