[jira] [Work logged] (HIVE-24274) Implement Query Text based MaterializedView rewrite

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

     [ https://issues.apache.org/jira/browse/HIVE-24274?focusedWorklogId=504808&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-504808 ]

ASF GitHub Bot logged work on HIVE-24274:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 26/Oct/20 17:11
            Start Date: 26/Oct/20 17:11
    Worklog Time Spent: 10m 
      Work Description: kasakrisz commented on a change in pull request #1561:
URL: https://github.com/apache/hive/pull/1561#discussion_r512129871



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java
##########
@@ -472,7 +474,7 @@ public RelNode genLogicalPlan(ASTNode ast) throws SemanticException {
     }
     profilesCBO = obtainCBOProfiles(queryProperties);
     disableJoinMerge = true;
-    final RelNode resPlan = logicalPlan();
+    final RelNode resPlan = logicalPlan(ast);

Review comment:
       Changed to `SemantiAnalyzer.ast`.




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

            Worklog Id:     (was: 504808)
    Remaining Estimate: 0h
            Time Spent: 10m

> Implement Query Text based MaterializedView rewrite
> ---------------------------------------------------
>
>                 Key: HIVE-24274
>                 URL: https://issues.apache.org/jira/browse/HIVE-24274
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Besides the way queries are currently rewritten to use materialized views in Hive this project provides an alternative:
> Compare the query text with the materialized views query text stored. If we found a match the original query's logical plan can be replaced by a scan on the materialized view.
> - Only materialized views which are enabled to rewrite can participate
> - Use existing *HiveMaterializedViewsRegistry* through *Hive* object by adding a lookup method by query text.
> - There might be more than one materialized views which have the same query text. In this case chose the first valid one.
> - Validation can be done by calling *Hive.validateMaterializedViewsFromRegistry()*
> - The scope of this first patch is rewriting queries which entire text can be matched only.
> - Use the expanded query text (fully qualified column and table names) for comparing



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