Jackie-Jiang opened a new pull request #6494:
URL: https://github.com/apache/incubator-pinot/pull/6494
## Description
Currently we allow transform function in the ingestion config to generate
derived columns during segment creation. This PR adds the support for
generating the derived columns during segment load so that derived columns can
be added on-the-fly.
TODOs:
- Support chained derived column
- Support raw derived column
- Support multi-value derived column
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