starocean999 commented on code in PR #64559: URL: https://github.com/apache/doris/pull/64559#discussion_r3464923821
########## fe/fe-core/src/main/java/org/apache/doris/nereids/stats/MemoStatsAndCostRecomputer.java: ########## @@ -0,0 +1,836 @@ +// 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.doris.nereids.stats; + +import org.apache.doris.common.Pair; +import org.apache.doris.nereids.CascadesContext; +import org.apache.doris.nereids.cost.Cost; +import org.apache.doris.nereids.cost.CostCalculator; +import org.apache.doris.nereids.memo.Group; +import org.apache.doris.nereids.memo.GroupExpression; +import org.apache.doris.nereids.properties.PhysicalProperties; +import org.apache.doris.nereids.trees.expressions.CTEId; +import org.apache.doris.nereids.trees.plans.Plan; +import org.apache.doris.nereids.trees.plans.algebra.Join; +import org.apache.doris.nereids.trees.plans.logical.LogicalCTEConsumer; +import org.apache.doris.nereids.trees.plans.logical.LogicalCTEProducer; +import org.apache.doris.nereids.trees.plans.logical.LogicalProject; +import org.apache.doris.nereids.trees.plans.physical.PhysicalCTEConsumer; +import org.apache.doris.nereids.trees.plans.physical.PhysicalCTEProducer; +import org.apache.doris.nereids.trees.plans.physical.PhysicalProject; +import org.apache.doris.qe.ConnectContext; +import org.apache.doris.statistics.Statistics; + +import com.google.common.collect.Lists; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Set; + +/** + * Re-estimate memo logical row counts and rebuild physical costs. + * and rebuild physical cost state. + */ +public final class MemoStatsAndCostRecomputer { + private static final double CHOSEN_PROJECT_STATS_DIVERGENCE_RATIO_THRESHOLD = 1_000D; + private final CascadesContext cascadesContext; + private final Map<CTEId, Statistics> cteIdToStats = new HashMap<>(); + private final LogicalExpressionRowCountSyncPolicy logicalExpressionRowCountSyncPolicy; + + private MemoStatsAndCostRecomputer(CascadesContext cascadesContext, + LogicalExpressionRowCountSyncPolicy logicalExpressionRowCountSyncPolicy) { + this.cascadesContext = cascadesContext; + this.logicalExpressionRowCountSyncPolicy = logicalExpressionRowCountSyncPolicy; + } + + /** + * recompute + */ + public static void recompute(Group rootGroup, PhysicalProperties physicalProperties, + CascadesContext cascadesContext) { + recompute(rootGroup, physicalProperties, cascadesContext, + LogicalExpressionRowCountSyncPolicy.KEEP_INDIVIDUAL_EXPRESSION_ROW_COUNT); + } + + /** + * recompute with configurable logical expression row count sync behavior. + */ + public static void recompute(Group rootGroup, PhysicalProperties physicalProperties, + CascadesContext cascadesContext, + LogicalExpressionRowCountSyncPolicy logicalExpressionRowCountSyncPolicy) { + MemoStatsAndCostRecomputer recomputer = new MemoStatsAndCostRecomputer(cascadesContext, + logicalExpressionRowCountSyncPolicy); + recomputer.seedProducerStats(rootGroup, new HashSet<>()); + recomputer.reestimateLogicalStatsBottomUp(rootGroup, new HashSet<>()); + // Run a second pass so CTE consumers and their ancestors can settle on producer stats refreshed above. + recomputer.reestimateLogicalStatsBottomUp(rootGroup, new HashSet<>()); + recomputer.recomputePhysicalCostsBottomUp(rootGroup, new HashSet<>()); + } + + private void seedProducerStats(Group group, Set<Group> visited) { + if (!visited.add(group)) { + return; + } + Statistics statistics = group.getStatistics(); + if (statistics != null) { + recordProducerStats(group, statistics); + } + for (Group child : getTraversalChildren(group)) { + seedProducerStats(child, visited); + } + } + + private void reestimateLogicalStatsBottomUp(Group group, Set<Group> visited) { + if (!visited.add(group)) { + return; + } + for (Group child : getTraversalChildren(group)) { + reestimateLogicalStatsBottomUp(child, visited); + } + reestimateCurrentGroup(group); + refreshEnforcerRowCount(group); + } + + private void reestimateCurrentGroup(Group group) { + List<GroupExpression> estimableExpressions = getEstimableLogicalExpressions(group); + if (estimableExpressions.isEmpty()) { + if (group.getLogicalExpressions().isEmpty()) { + reestimatePhysicalOnlyGroup(group); + } + return; + } + Statistics originalStatistics = group.getStatistics(); + boolean originalStatsReliable = group.isStatsReliable(); + Map<GroupExpression, Statistics> candidateStatisticsByExpression = new LinkedHashMap<>(); + Map<GroupExpression, Boolean> candidateStatsReliableByExpression = new LinkedHashMap<>(); + for (GroupExpression logicalExpression : estimableExpressions) { + List<Statistics> originalChildStatistics = replaceChildStatisticsForLogicalEstimation(logicalExpression); + group.setStatistics(null); + try { + estimateStats(logicalExpression); + } finally { + restoreChildStatistics(logicalExpression, originalChildStatistics); + } + Statistics estimatedStatistics = group.getStatistics(); + if (estimatedStatistics == null || !isValidCandidateStatistics(estimatedStatistics)) { + continue; + } + logicalExpression.setEstOutputRowCount(estimatedStatistics.getRowCount()); + candidateStatisticsByExpression.put(logicalExpression, new Statistics(estimatedStatistics)); + candidateStatsReliableByExpression.put(logicalExpression, group.isStatsReliable()); + } + if (candidateStatisticsByExpression.isEmpty()) { + group.setStatistics(originalStatistics); + group.setStatsReliable(originalStatsReliable); + return; + } + LogicalRowCountAggregationPolicy aggregationPolicy = getLogicalRowCountAggregationPolicy(); + Map<GroupExpression, Statistics> selectedCandidateStatisticsByExpression = filterCandidateStatisticsByPolicy( + aggregationPolicy, candidateStatisticsByExpression); + List<Statistics> candidateStatistics = new ArrayList<>(selectedCandidateStatisticsByExpression.values()); + double aggregatedRowCount = aggregationPolicy.aggregate(candidateStatistics); + Statistics updatedStatistics = resolveUpdatedGroupStatistics(group, selectedCandidateStatisticsByExpression, + candidateStatistics, aggregatedRowCount, originalStatistics); + boolean resolvedStatsReliable = resolveUpdatedGroupStatsReliability(group, + selectedCandidateStatisticsByExpression, candidateStatsReliableByExpression, + aggregatedRowCount); + group.setStatsReliable(resolvedStatsReliable); + group.setStatistics(updatedStatistics); + repairInvalidLogicalExpressionRowCounts(group, aggregatedRowCount); + refreshPhysicalExpressionRowCount(group, updatedStatistics.getRowCount()); + recordProducerStats(group, updatedStatistics); + if (shouldSyncLogicalExpressionRowCount()) { + syncLogicalExpressionRowCount(group, updatedStatistics.getRowCount()); + } + } + + private void reestimatePhysicalOnlyGroup(Group group) { + List<GroupExpression> estimableExpressions = getEstimablePhysicalExpressions(group); + if (estimableExpressions.isEmpty()) { + return; + } + Statistics originalStatistics = group.getStatistics(); + boolean originalStatsReliable = group.isStatsReliable(); + Map<GroupExpression, Statistics> candidateStatisticsByExpression = new LinkedHashMap<>(); + Map<GroupExpression, Boolean> candidateStatsReliableByExpression = new LinkedHashMap<>(); + for (GroupExpression physicalExpression : estimableExpressions) { + group.setStatistics(null); + estimateStats(physicalExpression); + Statistics estimatedStatistics = group.getStatistics(); + if (estimatedStatistics == null || !isValidCandidateStatistics(estimatedStatistics)) { + continue; + } + physicalExpression.setEstOutputRowCount(estimatedStatistics.getRowCount()); + candidateStatisticsByExpression.put(physicalExpression, new Statistics(estimatedStatistics)); + candidateStatsReliableByExpression.put(physicalExpression, group.isStatsReliable()); + } + if (candidateStatisticsByExpression.isEmpty()) { + group.setStatistics(originalStatistics); + group.setStatsReliable(originalStatsReliable); + return; + } + Statistics updatedStatistics = choosePhysicalOnlyGroupStatistics(group, candidateStatisticsByExpression, + originalStatistics); + boolean resolvedStatsReliable = resolvePhysicalOnlyGroupStatsReliability(group, + candidateStatisticsByExpression, candidateStatsReliableByExpression, + originalStatistics); + group.setStatsReliable(resolvedStatsReliable); + group.setStatistics(updatedStatistics); + refreshPhysicalExpressionRowCount(group, updatedStatistics.getRowCount()); + recordProducerStats(group, updatedStatistics); + } + + private boolean isValidCandidateStatistics(Statistics statistics) { + return Double.isFinite(statistics.getRowCount()) && statistics.getRowCount() >= 0; + } + + private void estimateStats(GroupExpression groupExpression) { + ConnectContext connectContext = cascadesContext.getConnectContext(); + StatsCalculator statsCalculator = new StatsCalculator( + groupExpression, + connectContext.getSessionVariable().getForbidUnknownColStats(), + connectContext.getTotalColumnStatisticMap(), + connectContext.getSessionVariable().isPlayNereidsDump(), + cteIdToStats, + cascadesContext); + statsCalculator.estimate(); + } + + private List<Statistics> replaceChildStatisticsForLogicalEstimation(GroupExpression logicalExpression) { Review Comment: no need change -- This is an automated message from the Apache Git Service. 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