[IGNORE](cudf): IBM-research-preview core changes only on top of velox @ a25666b #16213
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This change and cudf-exchange chages in PR should be complete ibm-research-preview changes on top of velox @ a25666b (latest used in presto as of Feb 2, 2026)
Author: @zoltan @dan13bauer @lga-zurich
Some fixes by @karthikeyann
This draft PR is to only view the relevant differences and split the changes to new PRs.
Do not merge.