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Posted to dev@phoenix.apache.org by "Istvan Toth (Jira)" <ji...@apache.org> on 2020/03/18 04:20:00 UTC
[jira] [Assigned] (PHOENIX-5065) Inconsistent treatment of NULL and
empty string
[ https://issues.apache.org/jira/browse/PHOENIX-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Istvan Toth reassigned PHOENIX-5065:
------------------------------------
Assignee: Richard Antal
> Inconsistent treatment of NULL and empty string
> -----------------------------------------------
>
> Key: PHOENIX-5065
> URL: https://issues.apache.org/jira/browse/PHOENIX-5065
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.14.1
> Reporter: Geoffrey Jacoby
> Assignee: Richard Antal
> Priority: Major
> Attachments: PHOENIX-5065.master.v1.patch, PHOENIX-5065.master.v2.patch, PHOENIX-5065.master.v3.patch, PHOENIX-5065.master.v4.patch, PHOENIX-5065.master.v5.patch
>
>
> Phoenix doesn't handle NULLs consistently with other SQL dialects, and it doesn't handle them consistently internally either.
> In PHOENIX-2422, [~jamestaylor] mentioned that Phoenix's intended behavior is for empty string and NULL to be equivalent. That's inconsistent with other SQL dialects (in which NULL is never equal to anything, including itself), but if that's our documented behavior, then that's fine unless PHOENIX-2422 to change it is ever worked.
> But consider the following queries:
> {code:java}
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID = '';
> -- Returns 0 rows
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID IS NULL;
> -- Returns some number of rows. Call it N
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID IN ('');
> -- Returns 0 rows
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID IN ('', 'FOO');
> -- Returns N rows. Note that FOO does not exist, and is just a nonsense string
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID = '' OR TENANT_ID = 'FOO'
> --Returns 0 rows, but slowly
> {code}
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