gianm opened a new pull request, #15680:
URL: https://github.com/apache/druid/pull/15680

   Useful for two reasons. First, we don't need to recompute the key set on 
every call to `keySet()`, `size()`, etc. Second, because when dimension 
discovery is *not* enabled, the parser requests the key set but does not call 
any methods on it. When the key set is lazy, we can avoid computing it entirely.
   
   Benchmarks:
   
   ```
   Benchmark                         Mode  Cnt     Score    Error  Units
   JsonLineReaderBenchmark.baseline  avgt    5  2055.294 ± 28.688  us/op 
[before]
   JsonLineReaderBenchmark.baseline  avgt   25  1755.839 ±  4.062  us/op [after]
   ```


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