Github user henrify commented on the issue:
https://github.com/apache/spark/pull/19943
@cloud-fan Oh you are right, it is indeed byte[][]. The BytesColumnVector
has separate per-row offset and length vectors/arrays, which seemed to indicate
that it would be contiguous block, and those auxiliary arrays/vectors are used
to mark the boundaries. I'm not sure why they need those two additional vectors
then.
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