should be it

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

@@ -0,0 +1,76 @@
+# name: test/sql/function/string/test_caseconvert.test
+# description: UPPER/LOWER test
+# group: [string]
+
+statement ok
+PRAGMA enable_verification
+
+# unicode
+query TTTT
+select UPPER('áaaá'), UPPER('ö'), LOWER('S̈'), UPPER('ω')
+----
+ÁAAÁ	Ö	s̈	Ω
+
+# greek
+query TT
+SELECT UPPER('Αα Ββ Γγ Δδ Εε Ζζ  Ηη Θθ Ιι Κκ Λλ Μμ Νν Ξξ Οο Ππ Ρρ Σσς Ττ Υυ Φφ Χχ Ψψ Ωω'), LOWER('Αα Ββ Γγ Δδ Εε Ζζ  Ηη Θθ Ιι Κκ Λλ Μμ Νν Ξξ Οο Ππ Ρρ Σσς Ττ Υυ Φφ Χχ Ψψ Ωω')
+----
+ΑΑ ΒΒ ΓΓ ΔΔ ΕΕ ΖΖ  ΗΗ ΘΘ ΙΙ ΚΚ ΛΛ ΜΜ ΝΝ ΞΞ ΟΟ ΠΠ ΡΡ ΣΣΣ ΤΤ ΥΥ ΦΦ ΧΧ ΨΨ ΩΩ	αα ββ γγ δδ εε ζζ  ηη θθ ιι κκ λλ μμ νν ξξ οο ππ ρρ σσς ττ υυ φφ χχ ψψ ωω
+
+# test upper/lower on scalar values
+query TTTT
+select UPPER(''), UPPER('hello'), UPPER('MotörHead'), UPPER(NULL)
+----
+(empty)	HELLO	MOTÖRHEAD	NULL
+
+query TTTT
+select LOWER(''), LOWER('hello'), LOWER('MotörHead'), LOWER(NULL)
+----
+(empty)	hello	motörhead	NULL
+
+# test ucase/lcase on scalar values
+query TTTT
+select UCASE(''), UCASE('hello'), UCASE('MotörHead'), UCASE(NULL)
+----
+(empty)	HELLO	MOTÖRHEAD	NULL
+
+query TTTT
+select LCASE(''), LCASE('hello'), LCASE('MotörHead'), LCASE(NULL)
+----
+(empty)	hello	motörhead	NULL
+
+# test on entire tables
+statement ok
+CREATE TABLE strings(a STRING, b STRING)
+
+statement ok
+INSERT INTO strings VALUES ('Hello', 'World'), ('HuLlD', NULL), ('MotörHead','RÄcks')
+
+query TT
+select UPPER(a), UCASE(a)  FROM strings
+----
+HELLO	HELLO
+HULLD	HULLD
+MOTÖRHEAD	MOTÖRHEAD
+
+query TT
+select LOWER(a), LCASE(a) FROM strings
+----
+hello	hello
+hulld	hulld
+motörhead	motörhead
+
+query TT
+select LOWER(b), LCASE(b) FROM strings
+----
+world	world
+NULL	NULL
+räcks	räcks
+
+# test with selection vector
+query TTTT
+select UPPER(a), LOWER(a), UCASE(a), LCASE(a) FROM strings WHERE b IS NOT NULL
+----
+HELLO	hello	HELLO	hello
+MOTÖRHEAD	motörhead	MOTÖRHEAD	motörhead
+