| /* |
| 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.size > 0) { |
| dfOpts.reduce((a, b) => unionDfOpts(a, b)) |
| } else None |
| } |
| |
| } |