# Custom functions

- [User-defined aggregation functions](/docs-lenses/lenses-docs-5.0/developers/sql-processor/streaming-sql/functions/custom-functions/user-defined-aggregation-functions.md)
- [User Defined functions](/docs-lenses/lenses-docs-5.0/developers/sql-processor/streaming-sql/functions/custom-functions/user-defined-functions.md)