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[VL] Fix function
input_file_name() outputs empty string in certain…
… query plan patterns (apache#7124)
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118 changes: 118 additions & 0 deletions
118
...ait/src/main/scala/org/apache/gluten/extension/columnar/PushDownInputFileExpression.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,118 @@ | ||
| /* | ||
| * 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.gluten.extension.columnar | ||
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| import org.apache.gluten.execution.{BatchScanExecTransformer, FileSourceScanExecTransformer} | ||
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| import org.apache.spark.sql.catalyst.expressions.{Alias, AttributeReference, Expression, InputFileBlockLength, InputFileBlockStart, InputFileName, NamedExpression} | ||
| import org.apache.spark.sql.catalyst.rules.Rule | ||
| import org.apache.spark.sql.execution.{DeserializeToObjectExec, LeafExecNode, ProjectExec, SerializeFromObjectExec, SparkPlan, UnionExec} | ||
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| import scala.collection.mutable | ||
|
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| /** | ||
| * The Spark implementations of input_file_name/input_file_block_start/input_file_block_length uses | ||
| * a thread local to stash the file name and retrieve it from the function. If there is a | ||
| * transformer node between project input_file_function and scan, the result of input_file_name is | ||
| * an empty string. So we should push down input_file_function to transformer scan or add fallback | ||
| * project of input_file_function before fallback scan. | ||
| * | ||
| * Two rules are involved: | ||
| * - Before offload, add new project before leaf node and push down input file expression to the | ||
| * new project | ||
| * - After offload, if scan be offloaded, push down input file expression into scan and remove | ||
| * project | ||
| */ | ||
| object PushDownInputFileExpression { | ||
| def containsInputFileRelatedExpr(expr: Expression): Boolean = { | ||
| expr match { | ||
| case _: InputFileName | _: InputFileBlockStart | _: InputFileBlockLength => true | ||
| case _ => expr.children.exists(containsInputFileRelatedExpr) | ||
| } | ||
| } | ||
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| object PreOffload extends Rule[SparkPlan] { | ||
| override def apply(plan: SparkPlan): SparkPlan = plan.transformUp { | ||
| case ProjectExec(projectList, child) if projectList.exists(containsInputFileRelatedExpr) => | ||
| val replacedExprs = mutable.Map[String, Alias]() | ||
| val newProjectList = projectList.map { | ||
| expr => rewriteExpr(expr, replacedExprs).asInstanceOf[NamedExpression] | ||
| } | ||
| val newChild = addMetadataCol(child, replacedExprs) | ||
| ProjectExec(newProjectList, newChild) | ||
| } | ||
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| private def rewriteExpr( | ||
| expr: Expression, | ||
| replacedExprs: mutable.Map[String, Alias]): Expression = | ||
| expr match { | ||
| case _: InputFileName => | ||
| replacedExprs | ||
| .getOrElseUpdate(expr.prettyName, Alias(InputFileName(), expr.prettyName)()) | ||
| .toAttribute | ||
| case _: InputFileBlockStart => | ||
| replacedExprs | ||
| .getOrElseUpdate(expr.prettyName, Alias(InputFileBlockStart(), expr.prettyName)()) | ||
| .toAttribute | ||
| case _: InputFileBlockLength => | ||
| replacedExprs | ||
| .getOrElseUpdate(expr.prettyName, Alias(InputFileBlockLength(), expr.prettyName)()) | ||
| .toAttribute | ||
| case other => | ||
| other.withNewChildren(other.children.map(child => rewriteExpr(child, replacedExprs))) | ||
| } | ||
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| private def addMetadataCol( | ||
| plan: SparkPlan, | ||
| replacedExprs: mutable.Map[String, Alias]): SparkPlan = | ||
| plan match { | ||
| case p: LeafExecNode => | ||
| ProjectExec(p.output ++ replacedExprs.values, p) | ||
| // Output of SerializeFromObjectExec's child and output of DeserializeToObjectExec must be | ||
| // a single-field row. | ||
| case p @ (_: SerializeFromObjectExec | _: DeserializeToObjectExec) => | ||
| ProjectExec(p.output ++ replacedExprs.values, p) | ||
| case p: ProjectExec => | ||
| p.copy( | ||
| projectList = p.projectList ++ replacedExprs.values.toSeq.map(_.toAttribute), | ||
| child = addMetadataCol(p.child, replacedExprs)) | ||
| case u @ UnionExec(children) => | ||
| val newFirstChild = addMetadataCol(children.head, replacedExprs) | ||
| val newOtherChildren = children.tail.map { | ||
| child => | ||
| // Make sure exprId is unique in each child of Union. | ||
| val newReplacedExprs = replacedExprs.map { | ||
| expr => (expr._1, Alias(expr._2.child, expr._2.name)()) | ||
| } | ||
| addMetadataCol(child, newReplacedExprs) | ||
| } | ||
| u.copy(children = newFirstChild +: newOtherChildren) | ||
| case p => p.withNewChildren(p.children.map(child => addMetadataCol(child, replacedExprs))) | ||
| } | ||
| } | ||
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| object PostOffload extends Rule[SparkPlan] { | ||
| override def apply(plan: SparkPlan): SparkPlan = plan.transformUp { | ||
| case p @ ProjectExec(projectList, child: FileSourceScanExecTransformer) | ||
| if projectList.exists(containsInputFileRelatedExpr) => | ||
| child.copy(output = p.output) | ||
| case p @ ProjectExec(projectList, child: BatchScanExecTransformer) | ||
| if projectList.exists(containsInputFileRelatedExpr) => | ||
| child.copy(output = p.output.asInstanceOf[Seq[AttributeReference]]) | ||
| } | ||
| } | ||
| } |