nfsantos opened a new pull request, #3147:
URL: https://github.com/apache/jackrabbit-oak/pull/3147

   https://issues.apache.org/jira/browse/OAK-12412
   
   `ImmutableRecordNumbers`'s iterator resolves each entry's record type via 
`RecordType.values()[type[pos]]` inside `computeNext()`/`getType()`. 
`Enum.values()` allocates and returns a new array on every call, so this array 
is needlessly re-allocated once per iterated entry.
   
   The set of `RecordType` values is fixed, so cache the array once in a 
`private static final` field and reuse it from the iterator instead of calling 
`RecordType.values()` per entry.
   
   No behavioral change intended.
   
   ## Test plan
   - [x] `mvn -pl oak-segment-tar test 
-Dtest=ImmutableRecordNumbersTest,RecordNumbersTest` passes


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