Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21912#discussion_r209878827
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
 ---
    @@ -735,70 +735,98 @@ class CodegenContext {
       }
     
       /**
    -   * Generates code creating a [[UnsafeArrayData]].
    +   * Generates code creating a [[UnsafeArrayData]] or [[GenericArrayData]] 
based on
    +   * given parameters.
        *
        * @param arrayName name of the array to create
    +   * @param elementType data type of the elements in source array
        * @param numElements code representing the number of elements the array 
should contain
    -   * @param elementType data type of the elements in the array
        * @param additionalErrorMessage string to include in the error message
    +   * @param elementSize optional value which shows the size of an element 
of the allocated
    +   *                    [[UnsafeArrayData]] or [[GenericArrayData]]
    +   *
    +   * @return code representing the allocation of [[ArrayData]]
    +   *         code representing a setter of an assignment for the generated 
array
        */
    -  def createUnsafeArray(
    +  def createArrayData(
    --- End diff --
    
    I think that it would be good to have a utility method to generate this 
call. WDYT?
    On the other hand, I agree that we have a method `setArrayElementFunc` or 
`setArrayElement`. Thus, we can split this method into two methods that have 
only one return value.


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