Fix built-in alias override

h2/src/main/org/h2/command/Parser.java

@@ -6013,7 +6013,14 @@ public class Parser {
 
     private CreateFunctionAlias parseCreateFunctionAlias(boolean force) {
         boolean ifNotExists = readIfNotExists();
-        String aliasName = readIdentifierWithSchema();
+        String aliasName;
+        if (currentTokenType != IDENTIFIER) {
+            aliasName = currentToken;
+            read();
+            schemaName = session.getCurrentSchemaName();
+        } else {
+            aliasName = readIdentifierWithSchema();
+        }
         final boolean newAliasSameNameAsBuiltin = Function.getFunction(database, aliasName) != null;
         if (database.isAllowBuiltinAliasOverride() && newAliasSameNameAsBuiltin) {
             // fine