org.apache.spark.sql.execution.RemoveRedundantWindowGroupLimits.scala Maven / Gradle / Ivy
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* The ASF licenses this file to You under the Apache License, Version 2.0
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.spark.sql.execution
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.execution.window.{Final, Partial, WindowGroupLimitExec}
/**
* Remove redundant partial WindowGroupLimitExec node from the spark plan. A partial
* WindowGroupLimitExec node is redundant when its child satisfies its required child distribution.
*/
object RemoveRedundantWindowGroupLimits extends Rule[SparkPlan] {
def apply(plan: SparkPlan): SparkPlan = plan transform {
case outer @ WindowGroupLimitExec(
_, _, _, _, Final, WindowGroupLimitExec(_, _, _, _, Partial, child))
if child.outputPartitioning.satisfies(outer.requiredChildDistribution.head) =>
val newOuter = outer.withNewChildren(Seq(child))
newOuter
}
}