comphead commented on code in PR #25381:
URL: https://github.com/apache/datafusion/pull/25381#discussion_r4028891856
##########
datafusion/sqllogictest/test_files/functions.slt:
##########
@@ -486,6 +486,35 @@ BAR Dictionary(Int32, Utf8)
statement ok
DROP TABLE upper_dictionary_test
+# upper and lower preserve input nullability in the planned schema
+statement ok
+CREATE TABLE case_nullability (a VARCHAR NOT NULL, b VARCHAR) AS VALUES ('Ab',
NULL)
+
+statement ok
+CREATE TABLE case_nullability_out AS
+SELECT upper(a) AS ua, lower(a) AS la, upper(b) AS ub FROM case_nullability
Review Comment:
you can use
```
> describe select upper('aaa');
+--------------------+-----------+-------------+
| column_name | data_type | is_nullable |
+--------------------+-----------+-------------+
| upper(Utf8("aaa")) | Utf8 | YES |
+--------------------+-----------+-------------+
```
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