/*
* Copyright 2016 Bloomberg LP
*
* Licensed 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 com.bloomberg.sparkflow.dc
import com.bloomberg.sparkflow.serialization.Hashing
import com.bloomberg.sparkflow.serialization.Hashing._
import org.apache.spark.sql.{Encoder, SparkSession}
/**
* ResultDependentDistributedCollection
*/
class ResultDepDC[U, T]
(encoder: Encoder[(T, U)], val prev: DC[T], dr: DR[U]) extends DC[(T, U)](encoder, Seq(prev, dr)) {
override def computeDataset(spark: SparkSession) = {
val result = dr.get(spark)
prev.getDataset(spark).mapPartitions(iterator => {
iterator.map(t => (t, result))
})
}
override def computeSignature() = {
hashString(prev.getSignature + dr.getSignature)
}
}
