[jira] [Commented] (HIVE-18334) Cannot JOIN ON result of COALESCE

["Hendrik Schultze (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-18334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17304336#comment-17304336 ] 

Hendrik Schultze commented on HIVE-18334:
-----------------------------------------

Can also reproduce on 2.3.3 through TEZ with and without cbo/pdp set.

> 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, 2.3.3
>         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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