zhengshiJ commented on code in PR #11454: URL: https://github.com/apache/doris/pull/11454#discussion_r961284259
########## fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/AnalyzeSubquery.java: ########## @@ -0,0 +1,134 @@ +// 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.analysis; + +import org.apache.doris.nereids.CascadesContext; +import org.apache.doris.nereids.rules.Rule; +import org.apache.doris.nereids.rules.RuleType; +import org.apache.doris.nereids.trees.expressions.Exists; +import org.apache.doris.nereids.trees.expressions.Expression; +import org.apache.doris.nereids.trees.expressions.InSubquery; +import org.apache.doris.nereids.trees.expressions.ScalarSubquery; +import org.apache.doris.nereids.trees.expressions.Slot; +import org.apache.doris.nereids.trees.expressions.SubqueryExpr; +import org.apache.doris.nereids.trees.expressions.literal.BooleanLiteral; +import org.apache.doris.nereids.trees.plans.logical.LogicalApply; +import org.apache.doris.nereids.trees.plans.logical.LogicalFilter; +import org.apache.doris.nereids.trees.plans.logical.LogicalPlan; +import org.apache.doris.nereids.trees.plans.logical.LogicalProject; + +import com.google.common.collect.ImmutableList; + +import java.util.ArrayList; +import java.util.List; +import java.util.Optional; +import java.util.stream.Collectors; + +/** + * AnalyzeSubquery. translate from subquery to correlatedJoin. + * In two steps + * The first step is to replace the predicate corresponding to the filter where the subquery is located. + * The second step converts the subquery into an apply node. + */ +public class AnalyzeSubquery implements AnalysisRuleFactory { + @Override + public List<Rule> buildRules() { + return ImmutableList.of( + RuleType.ANALYZE_FILTER_SUBQUERY.build( + logicalFilter().thenApply(ctx -> { + LogicalFilter filter = ctx.root; + List<SubqueryExpr> subqueryExprs = filter.getPredicates() + .collect(SubqueryExpr.class::isInstance); + if (subqueryExprs.isEmpty()) { + return filter; + } + + Optional<Expression> newPredicates = + recursiveReplacePredicate(filter.getPredicates()); + if (newPredicates.isPresent()) { + return new LogicalFilter<>( + newPredicates.get(), + analyzedSubquery(subqueryExprs, + (LogicalPlan) filter.child(), ctx.cascadesContext)); + } + return analyzedSubquery(subqueryExprs, + (LogicalPlan) filter.child(), ctx.cascadesContext); + }) + ) + ); + } + + /** + * Convert expressions with subqueries in filter. + * before: + * 1.filter(t1.a = scalarSubquery(output b)); + * 2.filter(inSubquery); inSubquery = (t1.a in select ***); + * 3.filter(exists); exists = (select ***); + * + * after: + * 1.filter(t1.a = b); + * 2.filter(True); + * 3.filter(True); + */ + private Optional<Expression> replaceSubquery(SubqueryExpr expr) { + if (expr instanceof InSubquery || expr instanceof Exists) { + return Optional.of(BooleanLiteral.TRUE); + } else if (expr instanceof ScalarSubquery) { + return Optional.of(expr.getQueryPlan().getOutput().get(0)); + } + return Optional.empty(); + } + + private Optional<Expression> recursiveReplacePredicate(Expression oldPredicate) { Review Comment: This implementation is also very simple -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
