Github user kiszk commented on the issue:

    https://github.com/apache/spark/pull/18014
  
    @cloud-fan Here is an implementation based on Option 2 only for simple data 
types (e.g. boolean, int, double, and so on). Used bulk-copy for array body in 
`putArray()`, and used [element-wise copy for null bit if `containsNull()` is 
true](https://github.com/apache/spark/pull/18014/files#diff-7738d15a778268fd8b5574e2c655a660R683)
 in `putArray()`.
    Do you have any comments/feedbacks?


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