[GitHub] [flink] twalthr commented on a change in pull request #11030: [FLINK-15935][table] Fix watermark can't work when depending both on flink planner and blink planner in project

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twalthr commented on a change in pull request #11030: [FLINK-15935][table] Fix watermark can't work when depending both on flink planner and blink planner in project
URL: https://github.com/apache/flink/pull/11030#discussion_r375814559
 
 

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 File path: flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/StreamWindowSQLExample.java
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+/*
+ * 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.examples.java;
+
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.table.api.EnvironmentSettings;
+import org.apache.flink.table.api.Table;
+import org.apache.flink.table.api.java.StreamTableEnvironment;
+import org.apache.flink.types.Row;
+
+import java.net.URL;
+import java.nio.file.Paths;
+
+/**
+ * Simple example for demonstrating the use of SQL in Java.
+ *
+ * <p>This example shows how to:
+ *  - Register a table via DDL
+ *  - Declare event time attribute in the DDL
+ *  - Run a streaming window aggregate on the registered table
+ *
+ */
+public class StreamWindowSQLExample {
+
+	// *************************************************************************
+	//     PROGRAM
+	// *************************************************************************
+
+	public static void main(String[] args) throws Exception {
+
+		// set up execution environment
+		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
+		// use blink planner in streaming mode,
+		// because watermark statement is only available in blink planner.
+		EnvironmentSettings settings = EnvironmentSettings.newInstance()
+			.useBlinkPlanner()
+			.inStreamingMode()
+			.build();
+		StreamTableEnvironment tEnv = StreamTableEnvironment.create(env, settings);
+
+		// get the absolute path of the source content file
+		URL res = StreamWindowSQLExample.class.getClassLoader().getResource("orders.csv");
+		String path = Paths.get(res.toURI()).toFile().getAbsolutePath();
+
+		// register table via DDL with watermark,
+		// the events are out of order, hence, we use 3 seconds to wait the late events
+		String ddl = "CREATE TABLE orders (\n" +
+			"  user_id INT,\n" +
+			"  product STRING,\n" +
+			"  amount INT,\n" +
+			"  ts TIMESTAMP(3),\n" +
+			"  WATERMARK FOR ts AS ts - INTERVAL '3' SECOND\n" +
+			") WITH (\n" +
+			"  'connector.type' = 'filesystem',\n" +
+			"  'connector.path' = '" + path + "',\n" +
+			"  'format.type' = 'csv'\n" +
+			")";
+		tEnv.sqlUpdate(ddl);
+
+		// run a SQL query on the table and retrieve the result as a new Table
+		String query = "SELECT \n" +
+			"  CAST(TUMBLE_START(ts, INTERVAL '5' SECOND) AS STRING) window_start, \n" +
+			"  COUNT(*) order_num, \n" +
 
 Review comment:
   nit: sometimes there is a space before the newline sometimes not

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