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https://issues.apache.org/jira/browse/PHOENIX-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713445#comment-16713445
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Geoffrey Jacoby commented on PHOENIX-5065:
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[~jamestaylor] - The first two queries are as I expect them to be, since I
don't have any tenants named empty-string and NULL is never equal to anything.
But even if we go with an empty-string / NULL equivalence, the combination of
the bottom 3 seem wrong to me.
Take the 3rd and 4th queries. Either the third query should return a non-zero
row count, or the fourth query shouldn't. The presence of an extra non-null
term in the IN parentheses (which is known to not exist) shouldn't affect how
the other terms in the IN clause are evaluated.
This is especially the case since I just tested a 5th query (now included
above) where it doesn't return rows if you look for empty string OR some other
non-existent value using equal rather than IN.
> 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
> Priority: Major
>
> 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.
> SELECT COUNT(*) FROM SYSTEM.CATALOG WHERE TENANT_ID = '' OR TENANT_ID = 'FOO'
> --Returns 0 rows, but slowly
> {code}
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