adriangb opened a new pull request, #21387:
URL: https://github.com/apache/datafusion/pull/21387
## Summary
- Adds `is_nullable(expression)` scalar UDF that returns the schema-level
nullability of the input expression as a boolean
- Completes the Arrow field introspection set alongside `arrow_typeof` and
`arrow_metadata`
- Returns `true` for nullable columns/expressions, `false` for non-nullable
ones (NOT NULL columns, concrete literals)
## Test plan
- [x] Added sqllogictest (`is_nullable.slt`) covering:
- Literal expressions (non-nullable: `is_nullable(1)` → false)
- NULL literal (nullable: `is_nullable(NULL)` → true)
- Nullable columns (`id`, `name` from `table_with_metadata`)
- Non-nullable columns (`ts`, `nonnull_name` from `table_with_metadata`)
- Expression nullability propagation (`id + 1` inherits nullable)
- [x] `cargo fmt --all` passes
- [x] `cargo clippy` passes
- [x] Regenerated `scalar_functions.md` docs
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