aokolnychyi commented on a change in pull request #1852: URL: https://github.com/apache/iceberg/pull/1852#discussion_r533428871
########## File path: spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDelete.scala ########## @@ -0,0 +1,152 @@ +/* + * 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.optimizer + +import java.util.UUID +import org.apache.spark.internal.Logging +import org.apache.spark.sql.{sources, AnalysisException} +import org.apache.spark.sql.catalyst.expressions.{Alias, Ascending, Attribute, AttributeReference, EqualNullSafe, Expression, InputFileName, Literal, Not, PredicateHelper, SortOrder, SubqueryExpression} +import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, DeleteFromTable, DynamicFileFilter, Filter, LogicalPlan, Project, RepartitionByExpression, ReplaceData, Sort} +import org.apache.spark.sql.catalyst.rules.Rule +import org.apache.spark.sql.connector.catalog.Table +import org.apache.spark.sql.connector.iceberg.catalog.ExtendedSupportsDelete +import org.apache.spark.sql.connector.iceberg.read.SupportsFileFilter +import org.apache.spark.sql.connector.iceberg.write.MergeBuilder +import org.apache.spark.sql.connector.write.{LogicalWriteInfo, LogicalWriteInfoImpl} +import org.apache.spark.sql.execution.datasources.DataSourceStrategy +import org.apache.spark.sql.execution.datasources.v2.{DataSourceV2Relation, DataSourceV2ScanRelation, PushDownUtils} +import org.apache.spark.sql.internal.SQLConf +import org.apache.spark.sql.types.{BooleanType, StructType} +import org.apache.spark.sql.util.CaseInsensitiveStringMap + +// TODO: should be part of early scan push down after the delete condition is optimized +object RewriteDelete extends Rule[LogicalPlan] with PredicateHelper with Logging { + + import org.apache.spark.sql.execution.datasources.v2.ExtendedDataSourceV2Implicits._ + + private val FILE_NAME_COL = "_file" + + override def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators { + // don't rewrite deletes that can be answered by passing filters to deleteWhere in SupportsDelete + case d @ DeleteFromTable(r: DataSourceV2Relation, Some(cond)) if isDeleteWhereCase(r, cond) => + d + + // rewrite all operations that require reading the table to delete records + case DeleteFromTable(r: DataSourceV2Relation, Some(cond)) => + // TODO: do a switch based on whether we get BatchWrite or DeltaBatchWrite + val writeInfo = newWriteInfo(r.schema) + val mergeBuilder = r.table.asMergeable.newMergeBuilder(writeInfo) + + val scanPlan = buildScanPlan(r.table, r.output, mergeBuilder, cond) + + val remainingRowFilter = Not(EqualNullSafe(cond, Literal(true, BooleanType))) + val remainingRowsPlan = Filter(remainingRowFilter, scanPlan) + + val batchWrite = mergeBuilder.asWriteBuilder.buildForBatch() + val writePlan = buildWritePlan(remainingRowsPlan, r.output) + ReplaceData(r, batchWrite, writePlan) + } + + private def buildScanPlan( + table: Table, + output: Seq[AttributeReference], + mergeBuilder: MergeBuilder, + cond: Expression): LogicalPlan = { + + val scanBuilder = mergeBuilder.asScanBuilder + + val predicates = splitConjunctivePredicates(cond) + val normalizedPredicates = DataSourceStrategy.normalizeExprs(predicates, output) + PushDownUtils.pushFilters(scanBuilder, normalizedPredicates) + + val scan = scanBuilder.build() + val scanRelation = DataSourceV2ScanRelation(table, scan, output) + + val scanPlan = scan match { + case _: SupportsFileFilter => + val matchingFilePlan = buildFileFilterPlan(cond, scanRelation) + val dynamicFileFilter = DynamicFileFilter(scanRelation, matchingFilePlan) + dynamicFileFilter + case _ => + scanRelation + } + + // include file name so that we can group data back + val fileNameExpr = Alias(InputFileName(), FILE_NAME_COL)() + Project(scanPlan.output :+ fileNameExpr, scanPlan) + } + + private def buildWritePlan( + remainingRowsPlan: LogicalPlan, + output: Seq[AttributeReference]): LogicalPlan = { + + // TODO: sort by _pos to keep the original ordering of rows + // TODO: consider setting a file size limit + + val fileNameCol = findOutputAttr(remainingRowsPlan, FILE_NAME_COL) + val numShufflePartitions = SQLConf.get.numShufflePartitions + val repartition = RepartitionByExpression(Seq(fileNameCol), remainingRowsPlan, numShufflePartitions) + val sort = Sort(Seq(SortOrder(fileNameCol, Ascending)), global = false, repartition) + Project(output, sort) + } + + private def isDeleteWhereCase(relation: DataSourceV2Relation, cond: Expression): Boolean = { Review comment: Agree. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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