[hotfix] revert unnecessary change

Author: leonardBang

flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/operators/transform/UserDefinedFunctionDescriptorTest.java

@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.cdc.runtime.operators.transform;
+
+import org.apache.flink.cdc.common.types.DataType;
+import org.apache.flink.cdc.common.types.DataTypes;
+import org.apache.flink.cdc.common.udf.UserDefinedFunction;
+import org.apache.flink.cdc.runtime.model.OpenAIEmbeddingModel;
+import org.apache.flink.table.functions.ScalarFunction;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/** Testcases for {@link UserDefinedFunctionDescriptor}. */
+class UserDefinedFunctionDescriptorTest {
+
+    /** This is a plain Flink CDC UDF. */
+    public static class CdcUdf implements UserDefinedFunction {}
+
+    /** This is a Flink CDC UDF with type hint. */
+    public static class CdcUdfWithTypeHint implements UserDefinedFunction {
+        @Override
+        public DataType getReturnType() {
+            return DataTypes.TIMESTAMP_LTZ(9);
+        }
+    }
+
+    /** This is a Flink ScalarFunction. */
+    public static class FlinkUdf extends ScalarFunction {}
+
+    /** This is not a valid UDF class. */
+    public static class NotUDF {}
+
+    @Test
+    void testUserDefinedFunctionDescriptor() throws JsonProcessingException {
+
+        assertThat(new UserDefinedFunctionDescriptor("cdc_udf", CdcUdf.class.getName()))
+                .extracting("name", "className", "classpath", "returnTypeHint", "isCdcPipelineUdf")
+                .containsExactly(
+                        "cdc_udf",
+                        "UserDefinedFunctionDescriptorTest$CdcUdf",
+                        "org.apache.flink.cdc.runtime.operators.transform.UserDefinedFunctionDescriptorTest$CdcUdf",
+                        null,
+                        true);
+
+        assertThat(
+                        new UserDefinedFunctionDescriptor(
+                                "cdc_udf_with_type_hint", CdcUdfWithTypeHint.class.getName()))
+                .extracting("name", "className", "classpath", "returnTypeHint", "isCdcPipelineUdf")
+                .containsExactly(
+                        "cdc_udf_with_type_hint",
+                        "UserDefinedFunctionDescriptorTest$CdcUdfWithTypeHint",
+                        "org.apache.flink.cdc.runtime.operators.transform.UserDefinedFunctionDescriptorTest$CdcUdfWithTypeHint",
+                        DataTypes.TIMESTAMP_LTZ(9),
+                        true);
+
+        assertThat(new UserDefinedFunctionDescriptor("flink_udf", FlinkUdf.class.getName()))
+                .extracting("name", "className", "classpath", "returnTypeHint", "isCdcPipelineUdf")
+                .containsExactly(
+                        "flink_udf",
+                        "UserDefinedFunctionDescriptorTest$FlinkUdf",
+                        "org.apache.flink.cdc.runtime.operators.transform.UserDefinedFunctionDescriptorTest$FlinkUdf",
+                        null,
+                        false);
+
+        assertThatThrownBy(
+                        () -> new UserDefinedFunctionDescriptor("not_udf", NotUDF.class.getName()))
+                .isExactlyInstanceOf(IllegalArgumentException.class)
+                .hasMessage(
+                        "Failed to detect UDF class class org.apache.flink.cdc.runtime.operators.transform.UserDefinedFunctionDescriptorTest$NotUDF "
+                                + "since it never implements interface org.apache.flink.cdc.common.udf.UserDefinedFunction or "
+                                + "extends Flink class org.apache.flink.table.functions.ScalarFunction.");
+
+        assertThatThrownBy(
+                        () ->
+                                new UserDefinedFunctionDescriptor(
+                                        "not_even_exist", "not.a.valid.class.path"))
+                .isExactlyInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Failed to instantiate UDF not_even_exist@not.a.valid.class.path");
+        String name = "GET_EMBEDDING";
+        assertThat(new UserDefinedFunctionDescriptor(name, OpenAIEmbeddingModel.class.getName()))
+                .extracting("name", "className", "classpath", "returnTypeHint", "isCdcPipelineUdf")
+                .containsExactly(
+                        "GET_EMBEDDING",
+                        "OpenAIEmbeddingModel",
+                        "org.apache.flink.cdc.runtime.model.OpenAIEmbeddingModel",
+                        DataTypes.ARRAY(DataTypes.FLOAT()),
+                        true);
+    }
+}