spark PlanAdaptiveSubqueries 源码

2022-10-20
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spark PlanAdaptiveSubqueries 代码

文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/PlanAdaptiveSubqueries.scala

/*
 * 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.adaptive

import org.apache.spark.sql.catalyst.expressions
import org.apache.spark.sql.catalyst.expressions.{CreateNamedStruct, DynamicPruningExpression, ListQuery, Literal}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.trees.TreePattern.{DYNAMIC_PRUNING_SUBQUERY, IN_SUBQUERY,
  SCALAR_SUBQUERY}
import org.apache.spark.sql.execution
import org.apache.spark.sql.execution.{BaseSubqueryExec, InSubqueryExec, SparkPlan}

case class PlanAdaptiveSubqueries(
    subqueryMap: Map[Long, BaseSubqueryExec]) extends Rule[SparkPlan] {

  def apply(plan: SparkPlan): SparkPlan = {
    plan.transformAllExpressionsWithPruning(
      _.containsAnyPattern(SCALAR_SUBQUERY, IN_SUBQUERY, DYNAMIC_PRUNING_SUBQUERY)) {
      case expressions.ScalarSubquery(_, _, exprId, _) =>
        execution.ScalarSubquery(subqueryMap(exprId.id), exprId)
      case expressions.InSubquery(values, ListQuery(_, _, exprId, _, _)) =>
        val expr = if (values.length == 1) {
          values.head
        } else {
          CreateNamedStruct(
            values.zipWithIndex.flatMap { case (v, index) =>
              Seq(Literal(s"col_$index"), v)
            }
          )
        }
        InSubqueryExec(expr, subqueryMap(exprId.id), exprId, shouldBroadcast = true)
      case expressions.DynamicPruningSubquery(value, _, _, _, _, exprId) =>
        DynamicPruningExpression(InSubqueryExec(value, subqueryMap(exprId.id), exprId))
    }
  }
}

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