[GitHub] [spark] LantaoJin opened a new pull request #24157: [WIP][SPARK-27216][CORE] Kryo serialization with RoaringBitmap

[GitBox <gi...@apache.org>]

LantaoJin opened a new pull request #24157: [WIP][SPARK-27216][CORE] Kryo serialization with RoaringBitmap
URL: https://github.com/apache/spark/pull/24157
 
 
   ## What changes were proposed in this pull request?
   
   HighlyCompressedMapStatus uses RoaringBitmap to record the empty blocks. But RoaringBitmap couldn't be ser/deser with unsafe KryoSerializer.
   
   ## How was this patch tested?
   
   Adding UT
   ```scala
     test("kryo serialization with RoaringBitmap") {
       val bitmap = new RoaringBitmap
       bitmap.add(1787)
   
       val safeSer = new KryoSerializer(conf).newInstance()
       val bitmap2 : RoaringBitmap = safeSer.deserialize(safeSer.serialize(bitmap))
       assert(bitmap2.equals(bitmap))
   
       conf.set("spark.kryo.unsafe", "true")
       val unsafeSer = new KryoSerializer(conf).newInstance()
       val bitmap3 : RoaringBitmap = unsafeSer.deserialize(unsafeSer.serialize(bitmap))
       assert(bitmap3.equals(bitmap)) // this will fail
     }
   ```
   

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