mitchlloyd opened a new issue #9311: Mark Tranform interface with 
@extensionPoint
URL: https://github.com/apache/druid/issues/9311
 
 
   ### Description
   
   Transforms were originally added to Druid in [this 
PR](https://github.com/apache/druid/pull/4890) and it's currently possible to 
add transform extensions. Has this interface settled enough to make this an 
official `@extensionPoint`.
   
   ### Motivation
   
   Our current use cases involve taking multiple fields at ingest time and 
running them through a large set of business rules to arrive at a single 
normalized value. Doing this work at ingest time saves us work at query time 
and provides historical consistency for these derived fields.
   
   Rather than having no compatibility guarantee, it would be nice to know that 
we have a deprecation  period to fix anything in our extension that needs to 
change.

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