[jira] [Commented] (FLINK-2410) PojoTypeInfo is not completely serializable

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727311#comment-14727311 ] 

ASF GitHub Bot commented on FLINK-2410:
---------------------------------------

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/943#discussion_r38529490
  
    --- Diff: flink-staging/flink-table/src/test/java/org/apache/flink/api/java/table/test/PojoGroupingITCase.java ---
    @@ -0,0 +1,109 @@
    +/*
    + * 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.api.java.table.test;
    +
    +import java.io.Serializable;
    +import org.apache.flink.api.common.operators.Order;
    +import org.apache.flink.api.java.DataSet;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.api.java.table.TableEnvironment;
    +import org.apache.flink.api.java.tuple.Tuple3;
    +import org.apache.flink.api.table.Table;
    +import org.apache.flink.core.fs.FileSystem;
    +import org.apache.flink.test.util.MultipleProgramsTestBase;
    +import org.junit.After;
    +import org.junit.Before;
    +import org.junit.Rule;
    +import org.junit.Test;
    +import org.junit.rules.TemporaryFolder;
    +import org.junit.runner.RunWith;
    +import org.junit.runners.Parameterized;
    +
    +@RunWith(Parameterized.class)
    +public class PojoGroupingITCase extends MultipleProgramsTestBase {
    +
    +	public PojoGroupingITCase(TestExecutionMode mode) {
    +		super(mode);
    +	}
    +
    +	private String resultPath;
    +	private String expected = "";
    +
    +	@Rule
    +	public TemporaryFolder tempFolder = new TemporaryFolder();
    +
    +	@Before
    +	public void before() throws Exception {
    +		resultPath = tempFolder.newFile().toURI().toString();
    +	}
    +
    +	@After
    +	public void after() throws Exception {
    +		compareResultsByLinesInMemory(expected, resultPath);
    +	}
    +
    +	@Test
    +	public void testPojoGrouping() throws Exception {
    +		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
    +
    +		DataSet<Tuple3<String, Double, String>> data = env.fromElements(
    +				new Tuple3<String, Double, String>("A", 23.0, "Z"),
    +				new Tuple3<String, Double, String>("A", 24.0, "Y"),
    +				new Tuple3<String, Double, String>("B", 1.0, "Z"));
    +
    +		TableEnvironment tableEnv = new TableEnvironment();
    +
    +		Table table = tableEnv
    +				.fromDataSet(data, "groupMe, value, name")
    +				.select("groupMe, value, name")
    +				.where("groupMe != 'B'");
    +
    +		DataSet<MyPojo> myPojos = tableEnv.toDataSet(table, MyPojo.class);
    +
    +		DataSet<MyPojo> result = myPojos.groupBy("groupMe")
    +				.sortGroup("value", Order.DESCENDING)
    +				.first(1);
    +		result.writeAsText(resultPath, FileSystem.WriteMode.OVERWRITE);
    --- End diff --
    
    Thanks for the hint, I'm now using `collect`.


> PojoTypeInfo is not completely serializable
> -------------------------------------------
>
>                 Key: FLINK-2410
>                 URL: https://issues.apache.org/jira/browse/FLINK-2410
>             Project: Flink
>          Issue Type: Bug
>          Components: Java API
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>
> Table API requires PojoTypeInfo to be serializable. The following code fails:
> {code}
> Table finishedEtlTable = maxMeasurements
> .join(stationTable).where("s_station_id = m_station_id")
> .select("year, month, day, value, country, name");
> DataSet<MaxTemperature> maxTemp = tableEnv.toDataSet(finishedEtlTable, MaxTemperature.class);
> maxTemp
> .groupBy("year")
> .sortGroup("value", Order.DESCENDING)
> .first(1)
> .print();
> {code}



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