Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/13680
  
    see https://github.com/apache/spark/pull/13680#discussion_r74798477
    
    We'd like to change the format to:
    [numElements] [null bits] [offset or primitive values] [values]
    
    in the `[offset or primitive values]`, we store the primitive values 
directly, or store length and offset for variable length element, like 
`UnsafeRow`
    in the `[values]`, we always align each element to 8 bytes.


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