Github user yaooqinn commented on the issue:

    https://github.com/apache/spark/pull/15071
  
    @hvanhovell
    I think unfixed length fields may lead to memory overlapping when 
```BuildLeft```, since we are reusing the ```BufferHolder``` to avoid writing 
the stream side repeatedly. In this case, the holder can not ```grow``` 
properly to avoid the left side overlap the right side.
    
    When ```BuildRight```, there is no such a problem.


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