Liquid-clustering boundary sampling [databricks] #15925
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| /* | ||
| * Copyright (c) 2026, NVIDIA CORPORATION. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| package org.apache.spark.sql.rapids.execution | ||
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| import scala.annotation.tailrec | ||
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| import com.nvidia.spark.rapids.{GpuCoalesceBatches, GpuExec, GpuFilterExec, GpuProjectExec} | ||
| import com.nvidia.spark.rapids.shims.ShimUnaryExecNode | ||
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| import org.apache.spark.rdd.RDD | ||
| import org.apache.spark.sql.catalyst.InternalRow | ||
| import org.apache.spark.sql.catalyst.expressions.{ | ||
| Attribute, Expression, ExprId, NamedExpression, SortOrder} | ||
| import org.apache.spark.sql.execution.SparkPlan | ||
| import org.apache.spark.sql.rapids.GpuFileSourceScanExec | ||
| import org.apache.spark.sql.types.StructType | ||
| import org.apache.spark.sql.vectorized.ColumnarBatch | ||
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| /** | ||
| * An auxiliary physical plan used to collect range-partition boundaries. | ||
| * | ||
| * The range exchange exposes this node as a subquery so Spark includes the narrow scan and its | ||
| * normal GPU metrics in the SQL physical plan. The exchange executes it once while constructing | ||
| * its range partitioner; the full-width exchange child remains the source of shuffled rows. | ||
| * | ||
| * This is an internal auxiliary node, not a CPU-to-GPU replacement registered with GpuOverrides. | ||
| * If the auxiliary plan cannot be built, the range exchange samples its original full-width GPU | ||
| * child instead. | ||
| */ | ||
| private[rapids] case class GpuRangeBoundaryExec(child: SparkPlan) | ||
| extends ShimUnaryExecNode with GpuExec { | ||
| override def output: Seq[Attribute] = child.output | ||
| override def nodeName: String = "GpuRangeBoundaryCollect" | ||
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| override protected def doExecute(): RDD[InternalRow] = | ||
| throw new IllegalStateException(s"Row-based execution should not occur for $this") | ||
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| override protected def internalDoExecuteColumnar(): RDD[ColumnarBatch] = | ||
| child.executeColumnar() | ||
| } | ||
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| /** | ||
| * Builds a key-only physical plan for range-boundary collection when it is safe to do so. | ||
| * Unsupported plans fall back to sampling the full exchange input. | ||
| */ | ||
| private[rapids] object GpuRangeBoundaryPlan { | ||
| private def referencedExprIds(expressions: Seq[Expression]): Set[ExprId] = | ||
| expressions.flatMap(_.references).map(_.exprId).toSet | ||
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| def build(plan: SparkPlan, ordering: Seq[SortOrder]): Option[GpuRangeBoundaryExec] = { | ||
| val required = referencedExprIds(ordering) | ||
| if (required.isEmpty) { | ||
| None | ||
| } else { | ||
| prune(plan, required).flatMap { pruned => | ||
| val selected = pruned.output.filter(attr => required.contains(attr.exprId)) | ||
| if (selected.map(_.exprId).toSet != required) { | ||
| None | ||
| } else { | ||
| val keyOnly = if (selected.length == pruned.output.length) { | ||
| pruned | ||
| } else { | ||
| GpuProjectExec(selected.toList, pruned) | ||
| } | ||
| Some(GpuRangeBoundaryExec(keyOnly)) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| private def selectProjectExpressions( | ||
| projectList: List[NamedExpression], | ||
| localOutputIds: Set[ExprId], | ||
| required: Set[ExprId]): Option[List[NamedExpression]] = { | ||
| val projectOutputIds = projectList.map(_.exprId).toSet | ||
| if (!required.subsetOf(projectOutputIds)) { | ||
| None | ||
| } else { | ||
| @tailrec | ||
| def dependencyClosure(needed: Set[ExprId]): List[NamedExpression] = { | ||
| val selected = projectList.filter(ne => needed.contains(ne.exprId)) | ||
| val localDependencies = referencedExprIds(selected).intersect(localOutputIds) | ||
| val expanded = needed ++ localDependencies | ||
| if (expanded == needed) selected else dependencyClosure(expanded) | ||
| } | ||
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| val selected = dependencyClosure(required) | ||
| // Boundary collection and shuffle input are separate executions of the source plan. | ||
| // Nondeterministic expressions can produce different keys if the executions use different | ||
| // batch boundaries, even when their seeds and partition IDs match. | ||
| if (selected.forall(_.deterministic)) Some(selected) else None | ||
| } | ||
| } | ||
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| private def prune(plan: SparkPlan, required: Set[ExprId]): Option[SparkPlan] = plan match { | ||
| case project: GpuProjectExec => | ||
| val childOutputIds = project.child.output.map(_.exprId).toSet | ||
| val projectOutputIds = project.projectList.map(_.exprId).toSet | ||
| val localOutputIds = projectOutputIds -- childOutputIds | ||
| selectProjectExpressions(project.projectList, localOutputIds, required).flatMap { selected => | ||
| // Keep project-local dependencies here instead of requesting aliases from the child scan. | ||
| val childRequired = referencedExprIds(selected) -- localOutputIds | ||
| prune(project.child, childRequired).map { child => | ||
| project.copy(projectList = selected.toList, child = child) | ||
| } | ||
| } | ||
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| case filter: GpuFilterExec if filter.condition.deterministic => | ||
| val childRequired = required ++ referencedExprIds(Seq(filter.condition)) | ||
| prune(filter.child, childRequired).map { child => | ||
| filter.withNewChildren(Seq(child)) | ||
| } | ||
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| case coalesce: GpuCoalesceBatches => | ||
| prune(coalesce.child, required).map { child => | ||
| coalesce.withNewChildren(Seq(child)) | ||
| } | ||
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| case scan: GpuFileSourceScanExec => | ||
| pruneFileScan(scan, required) | ||
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| case _ => | ||
| None | ||
| } | ||
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| private def pruneFileScan( | ||
| scan: GpuFileSourceScanExec, | ||
| required: Set[ExprId]): Option[GpuFileSourceScanExec] = { | ||
| if (!required.subsetOf(scan.output.map(_.exprId).toSet)) { | ||
| return None | ||
| } | ||
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| val dataColumnCount = scan.requiredSchema.length | ||
| val dataPairs = scan.output.take(dataColumnCount).zip(scan.requiredSchema.fields) | ||
| val partitionPairs = scan.output.drop(dataColumnCount).zip(scan.readPartitionSchema.fields) | ||
| val selectedData = dataPairs.filter { case (attr, _) => required.contains(attr.exprId) } | ||
| val selectedPartitions = | ||
| partitionPairs.filter { case (attr, _) => required.contains(attr.exprId) } | ||
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| val selectedOutput = selectedData.map(_._1) ++ selectedPartitions.map(_._1) | ||
| if (selectedOutput.map(_.exprId).toSet != required) { | ||
| None | ||
| } else { | ||
| val originalPartitionOutput = scan.originalOutput.drop(dataColumnCount) | ||
| Some(scan.copy( | ||
| originalOutput = selectedData.map(_._1) ++ originalPartitionOutput, | ||
| requiredSchema = StructType(selectedData.map(_._2)), | ||
| requiredPartitionSchema = Some(StructType(selectedPartitions.map(_._2))))(scan.rapidsConf)) | ||
| } | ||
| } | ||
| } | ||
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