[jira] [Work logged] (HIVE-25747) Make a cost base decision when rebuilding materialized views

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25747?focusedWorklogId=723018&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-723018 ]

ASF GitHub Bot logged work on HIVE-25747:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 08/Feb/22 17:27
            Start Date: 08/Feb/22 17:27
    Worklog Time Spent: 10m 
      Work Description: amansinha100 commented on a change in pull request #2881:
URL: https://github.com/apache/hive/pull/2881#discussion_r801882163



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/views/HiveScanCostSetterRule.java
##########
@@ -0,0 +1,83 @@
+package org.apache.hadoop.hive.ql.optimizer.calcite.rules.views;/*
+ * 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.
+ */
+
+import org.apache.calcite.plan.RelOptMaterialization;
+import org.apache.calcite.plan.RelOptRule;
+import org.apache.calcite.plan.RelOptRuleCall;
+import org.apache.calcite.rel.core.TableScan;
+import org.apache.hadoop.hive.common.TableName;
+import org.apache.hadoop.hive.metastore.api.SourceTable;
+import org.apache.hadoop.hive.metastore.api.Table;
+import org.apache.hadoop.hive.ql.metadata.MaterializedViewMetadata;
+import org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelFactories;
+import org.apache.hadoop.hive.ql.optimizer.calcite.RelOptHiveTable;
+import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveTableScan;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class HiveScanCostSetterRule extends RelOptRule {

Review comment:
       Could you add a comment about the intent of this rule ?

##########
File path: ql/src/java/org/apache/hadoop/hive/ql/ddl/view/materialized/alter/rebuild/AlterMaterializedViewRebuildAnalyzer.java
##########
@@ -399,8 +402,35 @@ private RelNode applyPartitionIncrementalRebuildPlan(
         return applyPreJoinOrderingTransforms(basePlan, mdProvider, executorProvider);
       }
 
-      return applyIncrementalRebuild(basePlan, mdProvider, executorProvider,
-              HiveInsertOnlyScanWriteIdRule.INSTANCE, HiveAggregatePartitionIncrementalRewritingRule.INSTANCE);
+      RelNode incrementalRebuildPlan = applyIncrementalRebuild(basePlan, mdProvider, executorProvider,
+              HiveInsertOnlyScanWriteIdRule.INSTANCE,
+              HiveAggregatePartitionIncrementalRewritingRule.INSTANCE);
+
+      HepProgramBuilder program = new HepProgramBuilder();
+      generatePartialProgram(program, false, HepMatchOrder.DEPTH_FIRST, HiveScanCostSetterRule.with(materialization));
+      incrementalRebuildPlan = executeProgram(incrementalRebuildPlan, program.build(), mdProvider, executorProvider);
+
+      // Make a cost-based decision factoring the configuration property
+      optCluster.invalidateMetadataQuery();
+      RelMetadataQuery.THREAD_PROVIDERS.set(HiveTezModelRelMetadataProvider.DEFAULT);
+      try {
+        // Multiply by 10.0 because this config is also used in applyAggregateInsertIncremental
+        final double factorSelectivity = HiveConf.getFloatVar(
+                conf, HiveConf.ConfVars.HIVE_MATERIALIZED_VIEW_REBUILD_INCREMENTAL_FACTOR) * 10.0;

Review comment:
       It wasn't clear why the magic factor of 10 was chosen and why the existing config was not sufficient. 




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 723018)
    Time Spent: 20m  (was: 10m)

> Make a cost base decision when rebuilding materialized views
> ------------------------------------------------------------
>
>                 Key: HIVE-25747
>                 URL: https://issues.apache.org/jira/browse/HIVE-25747
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, Materialized views
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Choose between full insert-overwrite and partition based incremental rebuild plan when rebuilding partitioned materialized views.



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