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

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# 7.11. 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.

- 7.11.1. between
- 7.11.2. edit_distance
- 7.11.3. geo_distance
- 7.11.4. geo_in_circle
- 7.11.5. geo_in_rectangle
- 7.11.6. highlight_full
- 7.11.7. highlight_html
- 7.11.8. html_untag
- 7.11.9. now
- 7.11.10. query
- 7.11.11. rand
- 7.11.12. snippet_html
- 7.11.13. sub_filter

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