| /* |
| * 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.spark.sql.execution.datasources.v2.jdbc |
| |
| import org.apache.spark.rdd.RDD |
| import org.apache.spark.sql.{Row, SQLContext} |
| import org.apache.spark.sql.connector.read.V1Scan |
| import org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation |
| import org.apache.spark.sql.sources.{BaseRelation, Filter, TableScan} |
| import org.apache.spark.sql.types.StructType |
| |
| case class JDBCScan( |
| relation: JDBCRelation, |
| prunedSchema: StructType, |
| pushedFilters: Array[Filter], |
| pushedAggregateColumn: Array[String] = Array(), |
| groupByColumns: Option[Array[String]]) extends V1Scan { |
| |
| override def readSchema(): StructType = prunedSchema |
| |
| override def toV1TableScan[T <: BaseRelation with TableScan](context: SQLContext): T = { |
| new BaseRelation with TableScan { |
| override def sqlContext: SQLContext = context |
| override def schema: StructType = prunedSchema |
| override def needConversion: Boolean = relation.needConversion |
| override def buildScan(): RDD[Row] = { |
| val columnList = if (groupByColumns.isEmpty) { |
| prunedSchema.map(_.name).toArray |
| } else { |
| pushedAggregateColumn |
| } |
| relation.buildScan(columnList, prunedSchema, pushedFilters, groupByColumns) |
| } |
| }.asInstanceOf[T] |
| } |
| |
| override def description(): String = { |
| val (aggString, groupByString) = if (groupByColumns.nonEmpty) { |
| val groupByColumnsLength = groupByColumns.get.length |
| (seqToString(pushedAggregateColumn.drop(groupByColumnsLength)), |
| seqToString(pushedAggregateColumn.take(groupByColumnsLength))) |
| } else { |
| ("[]", "[]") |
| } |
| super.description() + ", prunedSchema: " + seqToString(prunedSchema) + |
| ", PushedFilters: " + seqToString(pushedFilters) + |
| ", PushedAggregates: " + aggString + ", PushedGroupBy: " + groupByString |
| } |
| |
| private def seqToString(seq: Seq[Any]): String = seq.mkString("[", ", ", "]") |
| } |