fix[duckdb]: no to_struct in exporter

[joseph-isaacs]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 4.76190% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.17%. Comparing base (18dcc75) to head (9624758).
⚠️ Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-array/src/vectors.rs	0.00%	26 Missing ⚠️
vortex-duckdb/src/scan.rs	12.50%	14 Missing ⚠️

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