[GitHub] [pinot] richardstartin commented on pull request #7468: Replace emptiness checks with `isEmpty()`

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richardstartin commented on pull request #7468:
URL: https://github.com/apache/pinot/pull/7468#issuecomment-925311763


   Just in case the `String` change is contentious, this will not definitely 
not cause a performance regression:
   
   ```java
   @State(Scope.Benchmark)
   public class StringEmptyBenchmark {
   
     @Param({"", "not empty"})
     String string;
   
     @Benchmark
     public boolean isEmpty() {
       return string.isEmpty();
     }
   
     @Benchmark
     public boolean equalsEmpty() {
       return "".equals(string);
     }
   }
   ```
   
   ```
   Benchmark                          (string)  Mode  Cnt  Score   Error  Units
   StringEmptyBenchmark.equalsEmpty             avgt    5  3.720 ± 0.657  ns/op
   StringEmptyBenchmark.equalsEmpty  not empty  avgt    5  2.671 ± 0.011  ns/op
   StringEmptyBenchmark.isEmpty                 avgt    5  2.017 ± 0.016  ns/op
   StringEmptyBenchmark.isEmpty      not empty  avgt    5  1.997 ± 0.009  ns/op
   ```


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