Static review of PR #68335 at head c64d2d7 (base 70bf96e).

Two actionable regressions are called out inline:

• Nested registered-extension arrays: the new normalizer compacts a sliced parent before unwrapping extension children, so Arrow 24 cannot build list/struct parents containing ExtensionType children; the existing sliced nested JSON regression path fails.
• Row-ID/take_rows lifecycle: scanner profile counters are now lazy, so scanner-less phase-two fetches skip Lance data-cache byte statistics that were previously created and collected.

Review checkpoints:

• All ten authoritative changed paths were swept, including the converter extraction, nested normalization, scanner projection, generated search-result columns, global row IDs, runtime-filter/schema gating, close/reset paths, and test changes.
• Projection, global-rowid, runtime-filter, normal scanner reuse, build integration, and other candidate concerns were independently checked; no additional actionable issue was substantiated.
• Existing inline review comments were empty at the final duplicate-fence check, and the live base/head matched the authoritative bundle.
• No user-provided focus points were supplied beyond the complete-review requirement.
• This is a static review only: no builds or tests were run, so author/CI claims are not independent validation.

Static review of PR #68335 at head c64d2d7 (base 70bf96e).

Two actionable regressions are called out inline:

• Nested registered-extension arrays: the new normalizer compacts a sliced parent before unwrapping extension children, so Arrow 24 cannot build list/struct parents containing ExtensionType children; the existing sliced nested JSON regression path fails.
• Row-ID/take_rows lifecycle: scanner profile counters are now lazy, so scanner-less phase-two fetches skip Lance data-cache byte statistics that were previously created and collected.

Review checkpoints:

• All ten authoritative changed paths were swept, including the converter extraction, nested normalization, scanner projection, generated search-result columns, global row IDs, runtime-filter/schema gating, close/reset paths, and test changes.
• Projection, global-rowid, runtime-filter, normal scanner reuse, build integration, and other candidate concerns were independently checked; no additional actionable issue was substantiated.
• Existing inline review comments were empty at the final duplicate-fence check, and the live base/head matched the authoritative bundle.
• No user-provided focus points were supplied beyond the complete-review requirement.
• This is a static review only: no builds or tests were run, so author/CI claims are not independent validation.

Static review of PR #68335 at head c64d2d7 (base 70bf96e).

Two actionable regressions are called out inline:

• Nested registered-extension arrays: the new normalizer compacts a sliced parent before unwrapping extension children, so Arrow 24 cannot build list/struct parents containing ExtensionType children; the existing sliced nested JSON regression path fails.
• Row-ID/take_rows lifecycle: scanner profile counters are now lazy, so scanner-less phase-two fetches skip Lance data-cache byte statistics that were previously created and collected.

Review checkpoints:

• All ten authoritative changed paths were swept, including the converter extraction, nested normalization, scanner projection, generated search-result columns, global row IDs, runtime-filter/schema gating, close/reset paths, and test changes.
• Projection, global-rowid, runtime-filter, normal scanner reuse, build integration, and other candidate concerns were independently checked; no additional actionable issue was substantiated.
• Existing inline review comments were empty at the final duplicate-fence check, and the live base/head matched the authoritative bundle.
• No user-provided focus points were supplied beyond the complete-review requirement.
• This is a static review only: no builds or tests were run, so author/CI claims are not independent validation.