LuciferYang commented on PR #51954:
URL: https://github.com/apache/spark/pull/51954#issuecomment-3174893371
Today, while attempting to modify the test cases related to
`ImmutableMap.builder()` in the `RetryingBlockTransferorSuite`, I noticed a
minor difference between `Map.of` and `ImmutableMap.of`:
The map constructed by `Map.of` more like a `HashMap`, where the iteration
order is not necessarily the same as the order of data insertion. In contrast,
the map built by `ImmutableMap.of` resembles more of a `LinkedHashMap`, with
the iteration order matching the insertion order. I wonder if you've observed
this distinction. @dongjoon-hyun
```
scala> java.util.Map.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
val res0: java.util.Map[Int,Int] = {5=6, 7=8, 9=10, 1=2, 3=4}
val res0: java.util.Map[Int,Int]
scala> res0.keySet
val res1: java.util.Set[Int] = [5, 7, 9, 1, 3]
scala> com.google.common.collect.ImmutableMap.of(1, 2, 3, 4, 5, 6, 7, 8, 9,
10)
val res2: com.google.common.collect.ImmutableMap[Int,Int] = {1=2, 3=4, 5=6,
7=8, 9=10}
val res2: com.google.common.collect.ImmutableMap[Int,Int]
scala> res2.keySet
val res3: com.google.common.collect.ImmutableSet[Int] = [1, 3, 5, 7, 9]
```
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