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https://issues.apache.org/jira/browse/HIVE-22806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez resolved HIVE-22806.
--------------------------------------------
Fix Version/s: 4.0.0
Resolution: Duplicate
> Missing materialized view rewrite in case the filter is further narrowed
> ------------------------------------------------------------------------
>
> Key: HIVE-22806
> URL: https://issues.apache.org/jira/browse/HIVE-22806
> Project: Hive
> Issue Type: Bug
> Components: Materialized views
> Reporter: Zoltan Haindrich
> Priority: Major
> Fix For: 4.0.0
>
>
> I was checking some basic things when I've noticed that mv rewriting doesn't
> kick in for some cases:
> {code}
> explain
> SELECT empid, deptname
> FROM emps
> JOIN depts
> using (deptno)
> WHERE hire_date >= 600
> AND hire_date <= 1200 -- depending on the presence of this condition
> the rewrite may not happen
> ;
> {code}
> qtest:
> {code}
> set hive.support.concurrency=true;
> set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
> set hive.strict.checks.cartesian.product=false;
> set hive.stats.fetch.column.stats=true;
> set hive.materializedview.rewriting=true;
> -- create some tables
> CREATE TABLE emps (
> empid INT,
> deptno INT,
> name VARCHAR(256),
> salary FLOAT,
> hire_date int)
> STORED AS ORC
> TBLPROPERTIES ('transactional'='true');
>
> CREATE TABLE depts (
> deptno INT,
> deptname VARCHAR(256),
> locationid INT)
> STORED AS ORC
> TBLPROPERTIES ('transactional'='true');
> -- load data
> insert into emps values (100, 10, 'Bill', 10000, 1000), (200, 20, 'Eric',
> 8000, 500),
> (150, 10, 'Sebastian', 7000, null), (110, 10, 'Theodore', 10000, 250),
> (120, 10, 'Bill', 10000, 250)
> ;
> insert into depts values (10, 'Sales', 10), (30, 'Marketing', null), (20,
> 'HR', 20);
> alter table emps add constraint pk1 primary key (empid) disable novalidate
> rely;
> alter table depts add constraint pk2 primary key (deptno) disable novalidate
> rely;
> alter table emps add constraint fk1 foreign key (deptno) references
> depts(deptno) disable novalidate rely;
> -- create mv
> CREATE MATERIALIZED VIEW mv1
> AS
> SELECT empid, deptname, hire_date
> FROM emps JOIN depts
> using (deptno)
> -- ON (emps.deptno = depts.deptno)
> WHERE hire_date >= 500;
> -- expected to see that materialzed view is being used; however it doesnt:
> explain
> SELECT empid, deptname
> FROM emps
> JOIN depts
> using (deptno)
> WHERE hire_date >= 600
> AND hire_date <= 1200
> ;
> -- now we can see that the materialzed view is being used:
> explain
> SELECT empid, deptname
> FROM emps
> JOIN depts
> using (deptno)
> WHERE hire_date >= 600
> -- AND hire_date <= 1200
> ;
> {code}
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