clintropolis opened a new pull request, #18335:
URL: https://github.com/apache/druid/pull/18335

   ### Description
   changes:
   * `AutoTypeColumnMerger` now sets fields list properly on projected json 
column serializer via new `setFieldsAndOpenWriters` method which sets the 
fields list (to be shared with parent) and creates and opens field writers for 
the projected fields
   * `NestedDataColumnSerializer` now only writes fields and fieldsinfo during 
serialization if also writing the dictionaries, so a projected column will not 
serialize fields and fields info in favor of sharing with the base table column
   * added test for projected json column to ensure both with and without 
projections work correctly
   


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