spark ProjectEstimation 源码
spark ProjectEstimation 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/ProjectEstimation.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.statsEstimation
import org.apache.spark.sql.catalyst.expressions.AttributeMap
import org.apache.spark.sql.catalyst.plans.logical.{Project, Statistics}
object ProjectEstimation {
import EstimationUtils._
def estimate(project: Project): Option[Statistics] = {
if (rowCountsExist(project.child)) {
val childStats = project.child.stats
val aliasStats = EstimationUtils.getAliasStats(
project.expressions, childStats.attributeStats, childStats.rowCount.get)
val outputAttrStats =
getOutputMap(AttributeMap(childStats.attributeStats.toSeq ++ aliasStats), project.output)
Some(childStats.copy(
sizeInBytes = getOutputSize(project.output, childStats.rowCount.get, outputAttrStats),
attributeStats = outputAttrStats))
} else {
None
}
}
}
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