KKcorps opened a new pull request, #9599:
URL: https://github.com/apache/pinot/pull/9599

   Currently, when reading primary key objects during upsert, we initialize 
segment reader which creates record reader for all columns.
   This is problematic because we allocate direct byte buffers when 
initializing column reader for columns such as Strings.
   This leads to unnecessary high memory usage. 


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