# Extending Pinot

- [Writing Custom Aggregation Function](/release-0.4.0/developers/developers-and-contributors/extending-pinot/custom-aggregation-function.md)
- [Pluggable Streams](/release-0.4.0/developers/developers-and-contributors/extending-pinot/pluggable-streams.md)
- [Pluggable Storage](/release-0.4.0/developers/developers-and-contributors/extending-pinot/pluggable-storage.md)
- [Record Reader](/release-0.4.0/developers/developers-and-contributors/extending-pinot/record-reader.md)
- [Segment Fetchers](/release-0.4.0/developers/developers-and-contributors/extending-pinot/segment-fetchers.md)