spark PlanHelper 源码
spark PlanHelper 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/PlanHelper.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
import org.apache.spark.sql.catalyst.expressions.{Expression, Generator, WindowExpression}
import org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression
/**
* [[PlanHelper]] contains utility methods that can be used by Analyzer and Optimizer.
* It can also be container of methods that are common across multiple rules in Analyzer
* and Optimizer.
*/
object PlanHelper {
/**
* Check if there's any expression in this query plan operator that is
* - A WindowExpression but the plan is not Window
* - An AggregateExpression but the plan is not Aggregate or Window
* - A Generator but the plan is not Generate
* Returns the list of invalid expressions that this operator hosts. This can happen when
* 1. The input query from users contain invalid expressions.
* Example : SELECT * FROM tab WHERE max(c1) > 0
* 2. Query rewrites inadvertently produce plans that are invalid.
*/
def specialExpressionsInUnsupportedOperator(plan: LogicalPlan): Seq[Expression] = {
val exprs = plan.expressions
val invalidExpressions = exprs.flatMap { root =>
root.collect {
case e: WindowExpression
if !plan.isInstanceOf[Window] => e
case e: AggregateExpression
if !(plan.isInstanceOf[Aggregate] ||
plan.isInstanceOf[Window] ||
plan.isInstanceOf[CollectMetrics] ||
onlyInLateralSubquery(plan)) => e
case e: Generator
if !plan.isInstanceOf[Generate] => e
}
}
invalidExpressions
}
private def onlyInLateralSubquery(plan: LogicalPlan): Boolean = {
lazy val noAggInJoinCond = {
val join = plan.asInstanceOf[LateralJoin]
!(join.condition ++ join.right.joinCond).exists(AggregateExpression.containsAggregate)
}
plan.isInstanceOf[LateralJoin] && noAggInJoinCond
}
}
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