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https://issues.apache.org/jira/browse/HIVE-18334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Jackson updated HIVE-18334:
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Component/s: Query Processor
> Cannot JOIN ON result of COALESCE
> ----------------------------------
>
> Key: HIVE-18334
> URL: https://issues.apache.org/jira/browse/HIVE-18334
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 2.3.2
> Environment: Amazon AWS
> Release label:emr-5.11.0
> Hadoop distribution:Amazon 2.7.3
> Applications:Hive 2.3.2, Pig 0.17.0, Hue 4.0.1
> classification=hive-site,properties=[hive.strict.checks.cartesian.product=false,hive.mapred.mode=nonstrict]
> Reporter: Paul Jackson
> Priority: Minor
>
> A join is returning no results when the ON clause is equating the results of
> two COALESCE functions. To reproduce:
> {code:SQL}
> CREATE TABLE t5 (
> dno INTEGER,
> dname VARCHAR(30),
> eno INTEGER,
> ename VARCHAR(30));
> CREATE TABLE t6 (
> dno INTEGER,
> dname VARCHAR(30),
> eno INTEGER,
> ename VARCHAR(30));
> INSERT INTO t5 VALUES
> (10, 'FOO', NULL, NULL),
> (20, 'BAR', NULL, NULL),
> (NULL, NULL, 7300, 'LARRY'),
> (NULL, NULL, 7400, 'MOE'),
> (NULL, NULL, 7500, 'CURLY');
> INSERT INTO t6 VALUES
> (10, 'LENNON', NULL, NULL),
> (20, 'MCCARTNEY', NULL, NULL),
> (NULL, NULL, 7300, 'READY'),
> (NULL, NULL, 7400, 'WILLING'),
> (NULL, NULL, 7500, 'ABLE');
> -- Fails with 0 results
> SELECT *
> FROM t5
> INNER JOIN t6
> ON COALESCE(`t5`.`eno`, `t5`.`dno`) = COALESCE(`t6`.`eno`, `t6`.`dno`)
> -- Full cross with where clause works (in nonstrict mode), returning 5 results
> SELECT *
> FROM t5
> JOIN t6
> WHERE `t5`.`eno` = `t6`.`eno` OR `t5`.`dno` = `t6`.`dno`
> -- Strange that coalescing the same field returns 2 results...
> SELECT *
> FROM t5
> INNER JOIN t6
> ON COALESCE(`t5`.`dno`, `t5`.`dno`) = COALESCE(`t6`.`dno`, `t6`.`dno`)
> -- ...and coalescing the other field returns 3 results
> SELECT *
> FROM t5
> INNER JOIN t6
> ON COALESCE(`t5`.`eno`, `t5`.`eno`) = COALESCE(`t6`.`eno`, `t6`.`eno`)
> {code}
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