[jira] [Closed] (DRILL-1887) Wrong result for hash join on null valued columns

["Rahul Challapalli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-1887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rahul Challapalli closed DRILL-1887.
------------------------------------

Verified and added the below testcase

Functional/Passing/joins/inner/q1_DRILL-1887.sql

> Wrong result for hash join on null valued columns
> -------------------------------------------------
>
>                 Key: DRILL-1887
>                 URL: https://issues.apache.org/jira/browse/DRILL-1887
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Rahul Challapalli
>            Assignee: Aman Sinha
>             Fix For: 0.8.0
>
>         Attachments: 0001-DRILL-1887-Add-code-gen-for-explicitly-comparing-nul.patch
>
>
> git.commit.id.abbrev=9dfa4a1
> Dataset1:
> {code}
> {
>  "col1":1,
>  "col2":"abc"
> }
> {
>  "col1":2,
>  "col2":null
> }
> {code}
> Dataset 2:
> {code}
> {
>  "col1":1,
>  "col2":null
> }
> {
>  "col1":2,
>  "col2":null
> }
> {
>  "col1":2,
>  "col2":"abc"
> }
> {code}
> Query :
> {code}
> select * from `a.json` a join `b.json` b on a.col2=b.col2; 
> +------------+------------+------------+------------+
> |    col1    |    col2    |   col10    |   col20    |
> +------------+------------+------------+------------+
> | 1          | abc        | 2          | abc        |
> | 2          | null       | 1          | null       |
> | 2          | null       | 2          | null       |
> +------------+------------+------------+------------+
> {code}
> Most database engines treat 2 NULL values as not being equal. This makes it hard to compare DRILL's results against any Standard SQL engine. However I am not sure whether drill is intentionally designed to behave this way.



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