should be it

external/duckdb/test/sql/function/string/test_length.test

@@ -0,0 +1,38 @@
+# name: test/sql/function/string/test_length.test
+# description: Test length function
+# group: [string]
+
+statement ok
+SET default_null_order='nulls_first';
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TABLE strings(s VARCHAR)
+
+statement ok
+INSERT INTO strings VALUES ('hello'), ('world'), (NULL)
+
+# normal length
+query I
+SELECT length(s) FROM strings ORDER BY s
+----
+NULL
+5
+5
+
+# length after concat
+query I
+SELECT length(s || ' ' || '🦆') FROM strings ORDER BY s
+----
+NULL
+7
+7
+
+# aliases work
+query II
+SELECT char_length('asdf'), CHARACTER_LENGTH('asdf')
+----
+4
+4