spark LogicalPlanVisitor 源码
spark LogicalPlanVisitor 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlanVisitor.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.catalyst.plans.logical
/**
* A visitor pattern for traversing a [[LogicalPlan]] tree and computing some properties.
*/
trait LogicalPlanVisitor[T] {
def visit(p: LogicalPlan): T = p match {
case p: Aggregate => visitAggregate(p)
case p: Distinct => visitDistinct(p)
case p: Except => visitExcept(p)
case p: Expand => visitExpand(p)
case p: Filter => visitFilter(p)
case p: Generate => visitGenerate(p)
case p: GlobalLimit => visitGlobalLimit(p)
case p: Offset => visitOffset(p)
case p: Intersect => visitIntersect(p)
case p: Join => visitJoin(p)
case p: LocalLimit => visitLocalLimit(p)
case p: Pivot => visitPivot(p)
case p: Project => visitProject(p)
case p: Repartition => visitRepartition(p)
case p: RepartitionByExpression => visitRepartitionByExpr(p)
case p: RebalancePartitions => visitRebalancePartitions(p)
case p: Sample => visitSample(p)
case p: ScriptTransformation => visitScriptTransform(p)
case p: Union => visitUnion(p)
case p: Window => visitWindow(p)
case p: Tail => visitTail(p)
case p: Sort => visitSort(p)
case p: WithCTE => visitWithCTE(p)
case p: LogicalPlan => default(p)
}
def default(p: LogicalPlan): T
def visitAggregate(p: Aggregate): T
def visitDistinct(p: Distinct): T
def visitExcept(p: Except): T
def visitExpand(p: Expand): T
def visitFilter(p: Filter): T
def visitGenerate(p: Generate): T
def visitGlobalLimit(p: GlobalLimit): T
def visitOffset(p: Offset): T
def visitIntersect(p: Intersect): T
def visitJoin(p: Join): T
def visitLocalLimit(p: LocalLimit): T
def visitPivot(p: Pivot): T
def visitProject(p: Project): T
def visitRepartition(p: Repartition): T
def visitRepartitionByExpr(p: RepartitionByExpression): T
def visitRebalancePartitions(p: RebalancePartitions): T
def visitSample(p: Sample): T
def visitScriptTransform(p: ScriptTransformation): T
def visitUnion(p: Union): T
def visitWindow(p: Window): T
def visitTail(p: Tail): T
def visitSort(sort: Sort): T
def visitWithCTE(p: WithCTE): T
}
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