| /* |
| * 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.api.scala |
| |
| import org.apache.flink.api.common.typeinfo.TypeInformation |
| import org.apache.flink.api.scala._ |
| import org.apache.flink.table.api.Table |
| import org.apache.flink.table.expressions.Expression |
| |
| /** |
| * Holds methods to convert a [[DataSet]] into a [[Table]]. |
| * |
| * @param dataSet The [[DataSet]] to convert. |
| * @param inputType The [[TypeInformation]] for the type of the [[DataSet]]. |
| * @tparam T The type of the [[DataSet]]. |
| */ |
| class DataSetConversions[T](dataSet: DataSet[T], inputType: TypeInformation[T]) { |
| |
| /** |
| * Converts the [[DataSet]] into a [[Table]]. |
| * |
| * The field name of the new [[Table]] can be specified like this: |
| * |
| * {{{ |
| * val env = ExecutionEnvironment.getExecutionEnvironment |
| * val tEnv = TableEnvironment.getTableEnvironment(env) |
| * |
| * val set: DataSet[(String, Int)] = ... |
| * val table = set.toTable(tEnv, 'name, 'amount) |
| * }}} |
| * |
| * If not explicitly specified, field names are automatically extracted from the type of |
| * the [[DataSet]]. |
| * |
| * @param tableEnv The [[BatchTableEnvironment]] in which the new [[Table]] is created. |
| * @param fields The field names of the new [[Table]] (optional). |
| * @return The resulting [[Table]]. |
| */ |
| def toTable(tableEnv: BatchTableEnvironment, fields: Expression*): Table = { |
| if (fields.isEmpty) { |
| tableEnv.fromDataSet(dataSet) |
| } else { |
| tableEnv.fromDataSet(dataSet, fields: _*) |
| } |
| } |
| |
| } |
| |