kasakrisz commented on code in PR #3014: URL: https://github.com/apache/hive/pull/3014#discussion_r847360214
########## ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/HiveMaterializedViewASTSubQueryRewriteShuttle.java: ########## @@ -0,0 +1,189 @@ +/* + * 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.hadoop.hive.ql.optimizer.calcite; + +import org.apache.calcite.plan.RelOptCluster; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.tools.RelBuilder; +import org.apache.hadoop.hive.common.TableName; +import org.apache.hadoop.hive.ql.lockmgr.HiveTxnManager; +import org.apache.hadoop.hive.ql.metadata.Hive; +import org.apache.hadoop.hive.ql.metadata.HiveException; +import org.apache.hadoop.hive.ql.metadata.HiveRelOptMaterialization; +import org.apache.hadoop.hive.ql.metadata.Table; +import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveFilter; +import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveProject; +import org.apache.hadoop.hive.ql.optimizer.calcite.rules.views.HiveMaterializedViewUtils; +import org.apache.hadoop.hive.ql.parse.ASTNode; +import org.apache.hadoop.hive.ql.parse.CalcitePlanner; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.EnumSet; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.Stack; +import java.util.function.Predicate; + +import static java.util.Collections.singletonList; +import static java.util.Collections.unmodifiableMap; +import static java.util.Collections.unmodifiableSet; +import static org.apache.hadoop.hive.ql.metadata.HiveRelOptMaterialization.RewriteAlgorithm.NON_CALCITE; +import static org.apache.hadoop.hive.ql.optimizer.calcite.rules.views.HiveMaterializedViewUtils.extractTable; + +/** + * Traverse the plan and tries to rewrite subtrees of the plan to materialized view scans. + * + * The rewrite depends on whether the subtree's corresponding AST match with any materialized view + * definitions AST. + */ +public class HiveMaterializedViewASTSubQueryRewriteShuttle extends HiveRelShuttleImpl { + + private static final Logger LOG = LoggerFactory.getLogger(HiveMaterializedViewASTSubQueryRewriteShuttle.class); + + private final Map<RelNode, ASTNode> subQueryMap; + private final ASTNode originalAST; + private final ASTNode expandedAST; + private final RelBuilder relBuilder; + private final Hive db; + private final Set<TableName> tablesUsedByOriginalPlan; + private final HiveTxnManager txnManager; + + public HiveMaterializedViewASTSubQueryRewriteShuttle( + Map<RelNode, ASTNode> subQueryMap, + ASTNode originalAST, + ASTNode expandedAST, + RelBuilder relBuilder, + Hive db, + Set<TableName> tablesUsedByOriginalPlan, + HiveTxnManager txnManager) { + this.subQueryMap = unmodifiableMap(subQueryMap); + this.originalAST = originalAST; + this.expandedAST = expandedAST; + this.relBuilder = relBuilder; + this.db = db; + this.tablesUsedByOriginalPlan = unmodifiableSet(tablesUsedByOriginalPlan); + this.txnManager = txnManager; + } + + public RelNode rewrite(RelNode relNode) { + return relNode.accept(this); + } + + @Override + public RelNode visit(HiveProject project) { + if (!subQueryMap.containsKey(project)) { + // No AST is found for this subtree + return super.visit(project); + } + + // The AST associated to the RelNode is part of the original AST, but we need the expanded one + // 1. Collect the path elements of this node in the original AST + Stack<Integer> path = new Stack<>(); + ASTNode curr = subQueryMap.get(project); + while (curr != null && curr != originalAST) { + path.push(curr.getType()); + curr = (ASTNode) curr.getParent(); + } + + // 2. To find the AST node in the expanded we need the path elements in reverse order Review Comment: Rewritten to use deque. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
