151fdc224e
fix compilation error for inverted index compound directory
```
be/src/olap/rowset/segment_v2/inverted_index_compound_directory.cpp:249:32: error: comparison of unsigned expression in '< 0' is always false [-Werror=type-limits]
249 | if (h->_reader->size() < 0) {
| ~~~~~~~~~~~~~~~~~~~^~~
```