wip[expr]: nullability analysis

[joseph-isaacs]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.28%. Comparing base (036d44a) to head (bfacfde).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-expr/src/analysis.rs	0.00%	3 Missing ⚠️

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