Airblader commented on a change in pull request #15948: URL: https://github.com/apache/flink/pull/15948#discussion_r635060278
########## File path: flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/basics/WordCountSQLExample.java ########## @@ -0,0 +1,48 @@ +/* + * 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.basics; + +import org.apache.flink.table.api.EnvironmentSettings; +import org.apache.flink.table.api.TableEnvironment; + +/** The famous word count example that shows a minimal Flink SQL job in batch execution mode. */ +public final class WordCountSQLExample { + + public static void main(String[] args) throws Exception { + + // set up the Table API + final EnvironmentSettings settings = + EnvironmentSettings.newInstance().inBatchMode().build(); + final TableEnvironment tableEnv = TableEnvironment.create(settings); + + // execute a Flink SQL job and print the result locally + tableEnv.executeSql( + // define aggregation + "SELECT word, SUM(frequency) AS `count`\n" + // read from an artificial fixed-size table with rows and columns + + "FROM (\n" + + " VALUES ('Hello', 1), ('Ciao', 1), ('Hello', 2)\n" + + ")\n" + // name the table and its columns + + "AS WordTable(word, frequency)\n" Review comment: I was just trying to understand this based on the grammar in https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/sql/queries/overview/#syntax, but it seems the grammar there doesn't allow `SELECT * FROM (VALUES …)`. Maybe we can quickly fix the grammar in the docs here, though somewhat unrelated? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
