# groonga - An open-source fulltext search engine and column store.

- 日本語版はこちら

# 8.12. Function

Function can be used in some commands. For example, you can use function in `--filter`, `--scorer` and `output_columns` options of select.

This section describes about function and built-in functions.

TODO: Add documentations about function.

- 8.12.1. between
- 8.12.2. edit_distance
- 8.12.3. geo_distance
- 8.12.4. geo_in_circle
- 8.12.5. geo_in_rectangle
- 8.12.6. html_untag
- 8.12.7. now
- 8.12.8. query
- 8.12.9. rand
- 8.12.10. snippet_html
- 8.12.11. sub_filter