Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13439
@kiszk
1. The allocation mechanism is not changed in this patch. Just for the
column vector representing partition columns and null columns, this patch only
allocates 1 row.
2. I think the speed-up might come from simplified memory access. Because
we don't need to scan the memory space for all values. For the constant column
vectors, only one value is accessed. I don't know if elimination of index bound
helps or not. I will try to do that in `OnHeapColumnVector` and benchmark them
again to see the difference.
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