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fix: derive custom nullability for spark map_from_entries
Which issue does this PR close?
- Closes #19161
- Part of #19144
Rationale for this change
What changes are included in this PR?
- Spark
map_from_entriesnow usesreturn_field_from_argsto handle nullability
Are these changes tested?
- Added new unit tests to cover the changes
- Previous tests pass