feiniaofeiafei commented on code in PR #49096: URL: https://github.com/apache/doris/pull/49096#discussion_r2055644741
########## fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/JoinSkewAddSalt.java: ########## @@ -0,0 +1,212 @@ +// 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.rules.rewrite; + +import org.apache.doris.nereids.hint.DistributeHint; +import org.apache.doris.nereids.pattern.MatchingContext; +import org.apache.doris.nereids.rules.Rule; +import org.apache.doris.nereids.rules.RuleType; +import org.apache.doris.nereids.rules.exploration.join.JoinReorderContext; +import org.apache.doris.nereids.trees.expressions.Alias; +import org.apache.doris.nereids.trees.expressions.CaseWhen; +import org.apache.doris.nereids.trees.expressions.Cast; +import org.apache.doris.nereids.trees.expressions.EqualTo; +import org.apache.doris.nereids.trees.expressions.Expression; +import org.apache.doris.nereids.trees.expressions.InPredicate; +import org.apache.doris.nereids.trees.expressions.IsNull; +import org.apache.doris.nereids.trees.expressions.NamedExpression; +import org.apache.doris.nereids.trees.expressions.Slot; +import org.apache.doris.nereids.trees.expressions.SlotReference; +import org.apache.doris.nereids.trees.expressions.WhenClause; +import org.apache.doris.nereids.trees.expressions.functions.Function; +import org.apache.doris.nereids.trees.expressions.functions.generator.ExplodeNumbers; +import org.apache.doris.nereids.trees.expressions.functions.scalar.If; +import org.apache.doris.nereids.trees.expressions.functions.scalar.Random; +import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral; +import org.apache.doris.nereids.trees.expressions.literal.IntegerLiteral; +import org.apache.doris.nereids.trees.expressions.literal.NullLiteral; +import org.apache.doris.nereids.trees.plans.DistributeType; +import org.apache.doris.nereids.trees.plans.JoinType; +import org.apache.doris.nereids.trees.plans.Plan; +import org.apache.doris.nereids.trees.plans.algebra.SetOperation.Qualifier; +import org.apache.doris.nereids.trees.plans.logical.LogicalGenerate; +import org.apache.doris.nereids.trees.plans.logical.LogicalJoin; +import org.apache.doris.nereids.trees.plans.logical.LogicalProject; +import org.apache.doris.nereids.trees.plans.logical.LogicalUnion; +import org.apache.doris.nereids.types.DataType; +import org.apache.doris.nereids.types.IntegerType; +import org.apache.doris.nereids.types.TinyIntType; +import org.apache.doris.nereids.util.TypeCoercionUtils; + +import com.google.common.collect.ImmutableList; + +import java.util.ArrayList; +import java.util.List; +import java.util.Optional; +import java.util.stream.Collectors; + +/** + * LogicalJoin(type:inner, t1.a=t2.a, hint:skew(t1.a(1,2))) + * +--LogicalOlapScan(t1) + * +--LogicalOlapScan(t2) + * -> + * LogicalJoin (type:inner, t1.a=t2.a and r1=r2) + * |--LogicalProject (t1.a, CASE WHEN t1.a IS NULL THEN random(0, 999) + * WHEN t1.a IN (1, 2) THEN random(0, 999) ELSE 0 END AS r1)) + * | +--LogicalOlapScan(t1) + * +--LogicalProject (projections: t2.a, if(explodeNumber IS NULL, 0, explodeNumber) as r2) + * +--LogicalJoin (type=right_outer_join, t2.a=skewValue) + * |--LogicalGenerate(generators=[explode_numbers(1000)], generatorOutput=[explodeNumber]) + * | +--LogicalUnion(outputs=[skewValue], constantExprsList(1,2)) + * +--LogicalOlapScan(t2) + * */ +public class JoinSkewAddSalt extends OneRewriteRuleFactory { + private static final String RANDOM_COLUMN_NAME_LEFT = "r1"; + private static final String RANDOM_COLUMN_NAME_RIGHT = "r2"; + private static final String SKEW_VALUE_COLUMN_NAME = "skewValue"; + private static final String EXPLODE_NUMBER_COLUMN_NAME = "explodeColumn"; + + @Override + public Rule build() { + return logicalJoin().thenApply(JoinSkewAddSalt::transform).toRule(RuleType.JOIN_SKEW_ADD_SALT); + } + + private static Plan transform(MatchingContext<LogicalJoin<Plan, Plan>> ctx) { + LogicalJoin<Plan, Plan> join = ctx.root; + int factor = ctx.connectContext.getStatementContext().getConnectContext() + .getSessionVariable().joinSkewAddSaltExplodeFactor; + if (join.getJoinType() != JoinType.INNER_JOIN && join.getJoinType() != JoinType.LEFT_OUTER_JOIN + && join.getJoinType() != JoinType.RIGHT_OUTER_JOIN) { + return null; + } + if (join.isMarkJoin()) { + return null; + } + DistributeHint hint = join.getDistributeHint(); + if (hint.isSuccessInSkew()) { + return null; + } + Expression skewExpr = hint.getSkewExpr(); + if (hint.distributeType != DistributeType.SHUFFLE_RIGHT || skewExpr == null) { + return null; + } + if (!skewExpr.isSlot()) { + return null; + } + if (!join.left().getOutput().contains((Slot) skewExpr)) { + return null; + } + + Expression leftSkewExpr = null; + Expression rightSkewExpr = null; + for (Expression conjunct : join.getHashJoinConjuncts()) { + if (skewExpr.equals(conjunct.child(0))) { + leftSkewExpr = conjunct.child(0); + rightSkewExpr = conjunct.child(1); + break; + } else if (skewExpr.equals(conjunct.child(1))) { + leftSkewExpr = conjunct.child(1); + rightSkewExpr = conjunct.child(1); + break; + } + } + if (leftSkewExpr == null || rightSkewExpr == null) { + return null; + } + Optional<Expression> literalType = TypeCoercionUtils.characterLiteralTypeCoercion(String.valueOf(factor), + TinyIntType.INSTANCE); + if (!literalType.isPresent()) { + throw new RuntimeException(); + } + DataType type = literalType.get().getDataType(); + List<Expression> skewValues = join.getDistributeHint().getSkewValues(); + skewValues = skewValues.stream().filter(e -> !(e instanceof NullLiteral)).collect(Collectors.toList()); Review Comment: i think you are right. -- This is an automated message from the Apache Git Service. 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