gortiz commented on code in PR #12302:
URL: https://github.com/apache/pinot/pull/12302#discussion_r1463164751


##########
pinot-common/src/main/java/org/apache/pinot/common/function/FunctionRegistry.java:
##########
@@ -68,22 +83,67 @@ private FunctionRegistry() {
       }
       ScalarFunction scalarFunction = 
method.getAnnotation(ScalarFunction.class);
       if (scalarFunction.enabled()) {
-        // Annotated function names
-        String[] scalarFunctionNames = scalarFunction.names();
+        // Parse annotated function names and alias
+        Set<String> scalarFunctionNames = 
Arrays.stream(scalarFunction.names()).collect(Collectors.toSet());
+        if (scalarFunctionNames.size() == 0) {
+          scalarFunctionNames.add(method.getName());
+        }
+        boolean nullableParameters = scalarFunction.nullableParameters();
+        boolean varArg = scalarFunction.isVarArg();
+        registerFunction(method, scalarFunctionNames, nullableParameters, 
varArg);
+      }
+    }
+    Set<Class<?>> classes =
+        PinotReflectionUtils.getClassesThroughReflection(".*\\.function\\..*", 
ScalarFunction.class);

Review Comment:
   Why do we prefer to use reflection instead of [Service Provider 
Interface](https://www.baeldung.com/java-spi) like we did in index-spi?



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