gianm commented on pull request #10767:
URL: https://github.com/apache/druid/pull/10767#issuecomment-763398344


   When debugging a test failure, I realized that some additional work is 
needed to make the aggregator able to handle both complex inputs (existing 
theta sketches) and regular inputs (strings, primitives). There's some debt 
that needed to be paid down:
   
   - VectorColumnProcessorFactory had to be taught about complex columns, 
instead of handling them all as all-null string columns
   - Existing users of VectorColumnProcessorFactory had to be taught about 
complex columns too
   - To support the above, makeVectorProcessor needed to be moved from 
DimensionHandlerUtils to ColumnProcessors and harmonized with the 
ColumnProcessor stuff


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