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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