jcamachor commented on a change in pull request #952: HIVE-23006 ProbeDecode compiler support URL: https://github.com/apache/hive/pull/952#discussion_r392609447
########## File path: ql/src/java/org/apache/hadoop/hive/ql/optimizer/ProbeDecodeOptimizer.java ########## @@ -0,0 +1,139 @@ +/* + * 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; + +import org.apache.hadoop.hive.ql.exec.MapJoinOperator; +import org.apache.hadoop.hive.ql.exec.Operator; +import org.apache.hadoop.hive.ql.exec.TableScanOperator; +import org.apache.hadoop.hive.ql.parse.ParseContext; +import org.apache.hadoop.hive.ql.parse.SemanticException; +import org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc; +import org.apache.hadoop.hive.ql.plan.ExprNodeDesc; +import org.apache.hadoop.hive.ql.plan.MapJoinDesc; +import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory; +import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.Deque; +import java.util.HashMap; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; + +/** + * <p> The goal of this rule is to find suitable table scan operators that could reduce the + * number of rows decoded at runtime using extra available information. + * + * <p> First the rule checks all the available MapJoin operators that could propagate the + * smaller HashTable on the probing side (where TS is) to filter-out rows that would + * never match. To do so the HashTable information is pushed down to the TS properties. + * If the a single TS is used by multiple operators (shared-word), this rule Review comment: typo: word -> work ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
