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https://issues.apache.org/jira/browse/IMPALA-14731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18057354#comment-18057354
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Balazs Hevele commented on IMPALA-14731:
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https://gerrit.cloudera.org/#/c/23953/
> LIKE starting with % and ending with escaped % does not work correctly
> ----------------------------------------------------------------------
>
> Key: IMPALA-14731
> URL: https://issues.apache.org/jira/browse/IMPALA-14731
> Project: IMPALA
> Issue Type: Bug
> Reporter: Balazs Hevele
> Assignee: Balazs Hevele
> Priority: Critical
> Labels: Correctness
>
> As an example, {noformat}LIKE "%abc\%"{noformat} matches for any string
> containing "abc\", instead of "abc%" with any prefix.
> A very similar bug was fixed in
> https://issues.apache.org/jira/browse/IMPALA-2422 which fixes similar cases
> without the % at the start, e.g. {noformat}LIKE "abc\%"{noformat}.
> Example queries:
> 1.
> {noformat}
> +----------------------+
> | 'abc%' like '%abc\%' |
> +----------------------+
> | false | (should be true)
> +----------------------+
> {noformat}
> 2.
> {noformat}
> +-----------------------+
> | 'abc\\' like '%abc\%' |
> +-----------------------+
> | true | (should be false)
> +-----------------------+
> {noformat}
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