noon-stripe opened a new pull request, #8462:
URL: https://github.com/apache/pinot/pull/8462

   ## Description
   <!-- Add a description of your PR here.
   A good description should include pointers to an issue or design document, 
etc.
   -->
   This PR adds Ingestion Aggregation. The design doc can be found 
[here](https://github.com/apache/pinot/issues/8360). 
   
   This feature aggregates values at ingestion time, which reduces the number 
of rows stores (thus speeding up queries), using the same strategy as the 
'aggregateMetrics' feature. This expands the feature to include, COUNT, MIN, 
and MAX, with the ability to expand further. 
   
   
   ## Upgrade Notes
   Does this PR prevent a zero down-time upgrade? (Assume upgrade order: 
Controller, Broker, Server, Minion)
   * [ ] Yes (Please label as **<code>backward-incompat</code>**, and complete 
the section below on Release Notes)
   
   Does this PR fix a zero-downtime upgrade introduced earlier?
   * [ ] Yes (Please label this as **<code>backward-incompat</code>**, and 
complete the section below on Release Notes)
   
   Does this PR otherwise need attention when creating release notes? Things to 
consider:
   - New configuration options
   - Deprecation of configurations
   - Signature changes to public methods/interfaces
   - New plugins added or old plugins removed
   * [x] Yes (Please label this PR as **<code>release-notes</code>** and 
complete the section on Release Notes)
   ## Release Notes
   <!-- If you have tagged this as either backward-incompat or release-notes,
   you MUST add text here that you would like to see appear in release notes of 
the
   next release. -->
   Ingestion Pre-Aggregation is now supported for MIN, MAX, and COUNT, in 
addition to SUM. To enable the feature, add an aggregationConfig to the 
ingestionConfigs of a realtime table config. The format of the config is 
   
   ```
   "aggregationConfigs": [
     {
       "columnName": "destColumn",
       "aggregationFunction": "MIN(srcColumn)"
     }
   ],
   ```
   
   The destColumn must be in the schema and the srcColumn must not be in the 
schema. Additionally, all destColumns must be noDictionaryColumns. 
   
   
   <!-- If you have a series of commits adding or enabling a feature, then
   add this section only in final commit that marks the feature completed.
   Refer to earlier release notes to see examples of text.
   -->
   ## Documentation
   <!-- If you have introduced a new feature or configuration, please add it to 
the documentation as well.
   See 
https://docs.pinot.apache.org/developers/developers-and-contributors/update-document
   -->
   After this PR I will add the documentation. 
   


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