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

- 日本語

# 7.14. 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.

- 7.14.1. `between`
- 7.14.2. edit_distance
- 7.14.3. `fuzzy_search`
- 7.14.4. `geo_distance`
- 7.14.5. geo_in_circle
- 7.14.6. geo_in_rectangle
- 7.14.7. `highlight_full`
- 7.14.8. `highlight_html`
- 7.14.9. `html_untag`
- 7.14.10. `in_values`
- 7.14.11. now
- 7.14.12. `number_classify`
- 7.14.13. `prefix_rk_search`
- 7.14.14. `query`
- 7.14.15. rand
- 7.14.16. `record_number`
- 7.14.17. `snippet_html`
- 7.14.18. `string_substring`
- 7.14.19. `sub_filter`
- 7.14.20. `time_classify_day`
- 7.14.21. `time_classify_hour`
- 7.14.22. `time_classify_minute`
- 7.14.23. `time_classify_month`
- 7.14.24. `time_classify_second`
- 7.14.25. `time_classify_week`
- 7.14.26. `time_classify_year`
- 7.14.27. `vector_size`
- 7.14.28. `vector_slice`
- 7.14.29. `window_record_number`
- 7.14.30. `window_sum`