> For the complete documentation index, see [llms.txt](https://docs.pinot.apache.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pinot.apache.org/build-with-pinot/ingestion/transformations-and-aggregations.md). # Transformations and Aggregations Ingestion transformations clean up source records before they become Pinot rows. Ingestion aggregations reduce repeated values into fewer rows when a realtime table can safely store the summarized shape instead of the raw event stream. ## Transformations Use transformations to rename, reshape, extract, filter, or derive fields while ingesting. Keep the logic close to the table so the pipeline stays understandable. The detailed examples still live in [Ingestion Transformations](/build-with-pinot/ingestion/transformations-and-aggregations/ingestion-level-transformations.md), including [geospatial transform functions](/build-with-pinot/ingestion/transformations-and-aggregations/ingestion-level-transformations.md#geospatial-functions) such as `ST_Point` and `geoToH3`. ## Aggregations Use ingestion aggregation when the use case only needs summarized realtime data. This can reduce storage and improve query performance, but it changes the data you keep, so use it only when raw rows are not needed later. The detailed examples still live in [Ingestion Aggregations](/build-with-pinot/ingestion/transformations-and-aggregations/ingestion-level-aggregations.md). ## What this page covered This page covered when to transform or aggregate data during ingestion instead of waiting for query time. ## Next step Read the reference pages if you need the exact ingestion-config fields or table-config JSON. ## Related pages * [Ingestion](/build-with-pinot/ingestion.md) * [Batch Ingestion](/build-with-pinot/ingestion/batch-ingestion.md) * [Stream Ingestion](/build-with-pinot/ingestion/stream-ingestion.md) * [Formats and Filesystems](/build-with-pinot/ingestion/formats-filesystems.md) * [Original Ingestion Transformations](/build-with-pinot/ingestion/transformations-and-aggregations/ingestion-level-transformations.md) * [Original Ingestion Aggregations](/build-with-pinot/ingestion/transformations-and-aggregations/ingestion-level-aggregations.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.pinot.apache.org/build-with-pinot/ingestion/transformations-and-aggregations.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.