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https://issues.apache.org/jira/browse/DRILL-4684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Egbert van der Veen updated DRILL-4684:
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Attachment: actual result.png
expected result.png
> Incorrect behavior when joining RDBMS table on itself
> -----------------------------------------------------
>
> Key: DRILL-4684
> URL: https://issues.apache.org/jira/browse/DRILL-4684
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Egbert van der Veen
> Attachments: actual result.png, expected result.png
>
>
> When joining a RDBMS table on itself (for instance; with a table that
> contains both subitems and main items), Drill fails to correctly retrieve the
> result columns. This has been tested using both MySQL and PostgreSQL
> databases as storage providers.
> Code to reproduce:
> ```
> CREATE TABLE `join_test` (
> `id` int(11) NOT NULL,
> `type` varchar(50) DEFAULT NULL,
> `mainItem` int(11) DEFAULT NULL,
> `description` varchar(255) DEFAULT NULL,
> PRIMARY KEY (`id`),
> UNIQUE KEY `id` (`id`)
> ) ;
> INSERT INTO join_test (id, type, mainItem, description) VALUES (1,
> 'mainItem', null, 'First main item');
> INSERT INTO join_test (id, type, mainItem, description) VALUES (2, 'subItem',
> 1, 'First subitem of first main item');
> INSERT INTO join_test (id, type, mainItem, description) VALUES (3, 'subItem',
> 1, 'Second subitem of first main item');
> SELECT main.type firsttype, main.description firstdescription, sub.type
> secondtype, sub.description seconddescription
> FROM join_test sub
> JOIN join_test main ON sub.mainItem = main.id
> ```
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