com.stratio.deep.schema.DeepRowConverter.scala Maven / Gradle / Ivy

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A Spark SQl library for MongoDB

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/*
 *  Licensed to STRATIO (C) under one or more contributor license agreements.
 *  See the NOTICE file distributed with this work for additional information
 *  regarding copyright ownership. The STRATIO (C) 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 com.stratio.deep.schema

import org.apache.spark.rdd.RDD
import org.apache.spark.sql.Row
import org.apache.spark.sql.types.StructType

/**
 * Knows how to map from some Data Source native RDD to an {{{RDD[Row]}}}
 * @tparam T Original RDD type
 */
trait DeepRowConverter[T] {

  /**
   * Given a known schema,
   * it maps an RDD of some specified type to an {{{RDD[Row}}}
   * @param schema RDD native schema
   * @param rdd Current native RDD
   * @return A brand new RDD of Spark SQL Row type.
   */
  def asRow(schema: StructType, rdd: RDD[T]): RDD[Row]

}