Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19601
My prototype for nested array can handle nested array by changing
`UnsafeArray.getArray` and its callee methods, and does not require to change
`ColumnVector`.
If the refactoring takes more than several weeks, I can commit my prototype
to support nested array to be merged into Spark 2.3.
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