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https://issues.apache.org/jira/browse/HIVE-2594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163409#comment-13163409
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Navis commented on HIVE-2594:
-----------------------------
It's interesting.. Literals are decoded like below.
{code}
'aaa\%' --> 'aaa\%'
'aaa\\%' --> 'aaa\%'
'aaa\\\%' --> 'aaa\\%'
'aaa\\\\%' --> 'aaa\\%'
{code}
Basically all literals are escaped in SemanticAnalyzer. So other entities like
'UDFLike' might not have to try escape, IMHO. But
BaseSemanticAnalyzer#unescapeSQLString keeps preceding back slash as-is in some
cases like 'bs%' or 'bs_' which make impossible to identify whether it(=bs) is
a escape or a character.
> UDF LIKE can't handle literal '\' before '%'
> --------------------------------------------
>
> Key: HIVE-2594
> URL: https://issues.apache.org/jira/browse/HIVE-2594
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.8.0
> Reporter: Carl Steinbach
>
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