Github user rxin commented on the issue:
https://github.com/apache/spark/pull/18680
Have you guys checked the performance of this change? It changes the number
of concrete implementations for column vector from 2 to 3 (and potentially 1 to
2 at runtime). This might (or might not) have huge performance implications
because it might disable inlining, or force virtual dispatches. (It depends on
how we can column vector).
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