Github user xccui commented on a diff in the pull request:
https://github.com/apache/flink/pull/6090#discussion_r196996876
--- Diff:
flink-libraries/flink-sql-client/src/test/java/org/apache/flink/table/client/gateway/utils/UserDefinedFunctions.java
---
@@ -0,0 +1,105 @@
+/*
+ * 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.table.client.gateway.utils;
+
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.table.api.Types;
+import org.apache.flink.table.functions.AggregateFunction;
+import org.apache.flink.table.functions.ScalarFunction;
+import org.apache.flink.table.functions.TableFunction;
+import org.apache.flink.types.Row;
+
+/**
+ * A bunch of UDFs for SQL-Client test.
+ */
+public class UserDefinedFunctions {
--- End diff --
The testing functions provided in `flink-table` are mainly considered for
the functional test. While the functions added there are mainly considered for
the constructional test, i.e., I made the UDF constructors complex or event
sort of unreasonable...
---
