[SPARK-53805][SQL] Push Variant into DSv2 scan #52522
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What changes were proposed in this pull request?
Push Variant into DSv2 scan
Why are the changes needed?
with the change, DSV2 scan only needs to fetch the necessary shredded columns required by the plan
Does this PR introduce any user-facing change?
No
How was this patch tested?
new tests
Was this patch authored or co-authored using generative AI tooling?
No