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https://issues.apache.org/jira/browse/PHOENIX-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15439775#comment-15439775
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ASF GitHub Bot commented on PHOENIX-2641:
-----------------------------------------
Github user kliewkliew closed the pull request at:
https://github.com/apache/phoenix/pull/200
> Implicit wildcard in LIKE predicate search pattern
> --------------------------------------------------
>
> Key: PHOENIX-2641
> URL: https://issues.apache.org/jira/browse/PHOENIX-2641
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.7.0
> Environment: Phoenix 4.7.0 on Calcite 1.5.0
> Reporter: Kevin Liew
> Assignee: Kevin Liew
> Labels: newbie
>
> LIKE predicates have an implicit wildcard at the end of the search pattern
> ie.
> {code:sql}select distinct at1.col2 from at1 group by at1.col2 having at1.col2
> like '_'{code}
> will match every cell in col2 whereas it should only match single-character
> cells.
> This affects both VARCHAR and CHAR.
> Note that selecting by pattern '__' (two single-character wildcards) works
> properly for VARCHAR but not for CHAR (no result).
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