Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13439
@kiszk BTW, we can't simply do this by `ColumnarBatch.allocate` with
`maxRows=1`. Because we still need to take care of element access. In other
words, from outside, the vector looks like it has the same number of elements
as other columns, not just 1 row.
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