LantaoJin opened a new pull request #24264: [SPARK-27216][CORE] Upgrade 
RoaringBitmap to 0.7.45
URL: https://github.com/apache/spark/pull/24264
 
 
   ## 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.
   
   It's a bug of RoaringBitmap-0.5.11 and fixed in latest version.
   
   This is an update of #24157 
   
   ## How was this patch tested?
   
   Add a UT
   

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