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

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# 8.11. 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.

- 8.11.1. between
- 8.11.2. edit_distance
- 8.11.3. geo_distance
- 8.11.4. geo_in_circle
- 8.11.5. geo_in_rectangle
- 8.11.6. html_untag
- 8.11.7. now
- 8.11.8. query
- 8.11.9. rand
- 8.11.10. snippet_html
- 8.11.11. sub_filter

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