itschrispeck opened a new pull request, #13164:
URL: https://github.com/apache/pinot/pull/13164

   This PR contains two changes: 
   1. Add instrumentation for OOM protection to json index's 
getMatchingFlattenedDocsMap()
   2. Use lazy initialization when generating the map in `json_extract_index` 
transform function
   
   For the first change, we've seen the map can be very large and 
sampling/interruption check previously could not occur during map generation. 
   
   For the second, lazy initialization skips map generation entirely when 
filters exclude all results which can save significant resources depending on 
the query. 
   
   tags:  `enhancement` `performance` (?) 


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