WangGuangxin opened a new pull request #29375:
URL: https://github.com/apache/spark/pull/29375


   ### What changes were proposed in this pull request?
   The trim logic in Cast expression introduced in 
https://github.com/apache/spark/pull/26622 trim Chinese characters unexpectly.
   
   Before this patch
   
![image](https://user-images.githubusercontent.com/1312321/89513154-caad9b80-d806-11ea-9ebe-17c9e7d1b5b3.png)
   
   After this patch
   
![image](https://user-images.githubusercontent.com/1312321/89513196-d731f400-d806-11ea-959c-6a7dc29dcd49.png)
   
   
   ### Why are the changes needed?
   The behavior described above doesn't make sense, and also doesn't consistent 
with the behavior when cast a string to double/float, as well as doesn't 
consistent with the behavior of Hive
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes
   
   
   ### How was this patch tested?
   Added more UT
   


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