xuyang1706 commented on a change in pull request #9373: [FLINK-13596][ml] Add two utils for Table transformations URL: https://github.com/apache/flink/pull/9373#discussion_r340577970
########## File path: flink-ml-parent/flink-ml-lib/src/main/java/org/apache/flink/ml/common/utils/RowTypeDataSet.java ########## @@ -0,0 +1,168 @@ +/* + * 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.ml.common.utils; + +import org.apache.flink.api.common.functions.MapFunction; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.DataSet; +import org.apache.flink.api.java.operators.SingleInputUdfOperator; +import org.apache.flink.api.java.operators.TwoInputUdfOperator; +import org.apache.flink.api.java.typeutils.RowTypeInfo; +import org.apache.flink.ml.common.MLEnvironment; +import org.apache.flink.ml.common.MLEnvironmentFactory; +import org.apache.flink.table.api.Table; +import org.apache.flink.table.api.TableSchema; +import org.apache.flink.types.Row; + +/** + * Provide functions of conversions between DataSet and Table. + */ +public class RowTypeDataSet { + /** + * Convert the given Table to {@link DataSet DataSet<Row>}. + * + * @param sessionId the sessionId of {@link MLEnvironmentFactory} + * @param table the Table to convert. + * @return the converted DataSet. + */ + public static DataSet <Row> fromTable(Long sessionId, Table table) { + return MLEnvironmentFactory.get(sessionId).getBatchTableEnvironment().toDataSet(table, Row.class); + } + + /** + * Convert the given DataSet into a Table with specified TableSchema. + * + * @param sessionId the sessionId of {@link MLEnvironmentFactory} + * @param data the DataSet to convert. + * @param schema the specified TableSchema. + * @return the converted Table. + */ + public static Table toTable(Long sessionId, DataSet <Row> data, TableSchema schema) { + return toTable(sessionId, data, schema.getFieldNames(), schema.getFieldTypes()); Review comment: refer the reply below. ---------------------------------------------------------------- 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: us...@infra.apache.org With regards, Apache Git Services
