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https://issues.apache.org/jira/browse/PHOENIX-3046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15479742#comment-15479742
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Julian Hyde commented on PHOENIX-3046:
--------------------------------------
According to the standard, {{LIKE}} and {{NOT LIKE}} will return {{UNKNOWN}}
(aka boolean NULL) when applied to a null value. Pretty much all of SQL's
standard operators use 3-value logic.
This means that {{c NOT LIKE pattern}} is always the same as {{NOT (c LIKE
pattern)}}, which is good.
> `NOT LIKE '%'` unexpectedly returns results
> -------------------------------------------
>
> Key: PHOENIX-3046
> URL: https://issues.apache.org/jira/browse/PHOENIX-3046
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.7.0
> Reporter: Kevin Liew
> Assignee: Kevin Liew
> Priority: Minor
> Labels: like, like-predicate, phoenix, regex, wildcard, wildcards
> Fix For: 4.9.0, 4.8.1
>
>
> The following returns all rows in the table when it should return no rows:
> {code}select * from emp where first_name not like '%'{code}
> The following returns no rows as expected:
> {code}select * from emp where first_name not like '%%'{code}
> first_name is a VARCHAR column
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