Add lcase/ucase + make lower/upper case-insensitive #3715

dbms/src/Functions/lower.cpp

@@ -15,7 +15,8 @@ using FunctionLower = FunctionStringToString<LowerUpperImpl<'A', 'Z'>, NameLower
 
 void registerFunctionLower(FunctionFactory & factory)
 {
-    factory.registerFunction<FunctionLower>();
+    factory.registerFunction<FunctionLower>(FunctionFactory::CaseInsensitive);
+    factory.registerAlias("lcase", "lower", FunctionFactory::CaseInsensitive);
 }
 
 }

dbms/src/Functions/upper.cpp

@@ -15,7 +15,8 @@ using FunctionUpper = FunctionStringToString<LowerUpperImpl<'a', 'z'>, NameUpper
 
 void registerFunctionUpper(FunctionFactory & factory)
 {
-    factory.registerFunction<FunctionUpper>();
+    factory.registerFunction<FunctionUpper>(FunctionFactory::CaseInsensitive);
+    factory.registerAlias("ucase", "upper", FunctionFactory::CaseInsensitive);
 }
 
 }

dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.reference

+foo
+FOO
+foo
+FOO

dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.sql

+SET send_logs_level = 'none';
+
+select lcase('FOO');
+select ucase('foo');
+select LOWER('Foo');
+select UPPER('Foo');