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Date: Tue, 6 Dec 2011 07:19:40 +0000 (UTC)
From: "Navis (Commented) (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2594) UDF LIKE can't handle literal '\'
 before '%'
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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 ] 

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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