Github user robbinspg commented on the pull request:

    https://github.com/apache/spark/pull/10628#issuecomment-204684533
  
    So big endian implementations of  OffHeapColumnVector and 
OnHeapColumnVector are needed. I don't think we'd want to have an inline 'if 
(bigEndian)' in the relevent methods so it may be that we'd want to subclass 
those classes, override the methods which require handling big endian, and 
instantiate the big endian version in ColumnVector.allocate if on a BE platform?
    
    xxxHeapColumnVector classes would have to lose the 'final' attribute.


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