| /* |
| * 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.griffin.measure.step.read |
| |
| import org.apache.spark.sql._ |
| |
| import org.apache.griffin.measure.context.DQContext |
| import org.apache.griffin.measure.utils.DataFrameUtil._ |
| |
| case class UnionReadStep(name: String, readSteps: Seq[ReadStep]) extends ReadStep { |
| |
| val config: Map[String, Any] = Map() |
| val cache: Boolean = false |
| |
| def read(context: DQContext): Option[DataFrame] = { |
| val dfOpts = readSteps.map { readStep => |
| readStep.read(context) |
| } |
| if (dfOpts.nonEmpty) { |
| dfOpts.reduce((a, b) => unionDfOpts(a, b)) |
| } else None |
| } |
| |
| } |