viirya commented on issue #24960: [SPARK-28156][SQL] Self-join should not miss 
cached view
URL: https://github.com/apache/spark/pull/24960#issuecomment-508326123
 
 
   Thanks @cloud-fan 
   
   I also visited #24236 as you mentioned. I think it is fine from missing 
caches. Because when you cache an union with duplicate children, you actually 
cache the deduplicated plan processed by #24236. In later you have this query 
fragment in other queries, the deduplicated union will match cached version.
   
   

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