wangyum opened a new pull request #29726:
URL: https://github.com/apache/spark/pull/29726


   ### What changes were proposed in this pull request?
   
   For some filtering side can not broadcast by join type but can broadcast by 
size, then we should not consider reuse broadcast only, for example:
   
   Left outer join and left side very small.
   
   ### Why are the changes needed?
   
   Improve query performance for this case:
   
![image](https://user-images.githubusercontent.com/5399861/92882197-445a2a00-f442-11ea-955d-16a7724e535b.png)
   
   
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   
   ### How was this patch tested?
   
   Unit test.
   


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