[master][pick] Forward-port Parquet nullable selection and Iceberg Variant reads - #66413

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Gabriel39 wants to merge 9 commits into

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Gabriel39:dev/forward-port-66397-66302-master

Commits on Aug 4, 2026

[opt](parquet) Fuse fragmented nullable selection planning (#66397)
Gabriel39
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53cfbd5
[feature](variant) Support reading Iceberg Variant from Parquet (#66302)
Gabriel39
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37895aa
[fix](catalog) Safely publish storage adapter snapshots (#66392)
Gabriel39
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6adba50
[fix](iceberg) Harden Variant compatibility and validation
Gabriel39
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ef5b270
test: expand Iceberg Variant read coverage
Gabriel39
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5961faf
fix: preserve nested Variant append atomicity
Gabriel39
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9a79290
[fix](parquet) Isolate Variant planning from ordinary scans
Gabriel39
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f4695e4
[fix](variant) Preserve projected shredded states across exchange
Gabriel39
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c098187
[fix](variant) Adapt shredded callback to master
Gabriel39
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5184541