EeshanBembi opened a new pull request, #19207:
URL: https://github.com/apache/datafusion/pull/19207
## Which issue does this PR close?
Closes #19172
## What changes are included in this PR?
Implement `return_field_from_args` for `SparkElt` to correctly report
nullability based on
input field nullability, instead of always returning `nullable=true`.
## Are these changes tested?
Yes, added unit test `test_elt_nullability` that verifies:
- Result is non-nullable when all inputs are non-nullable
- Result is nullable when index is nullable
- Result is nullable when any value is nullable
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