[jira] Commented: (LUCENE-573) Escaped quotes inside a phrase cause a ParseException

["Michael Busch (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/LUCENE-573?page=comments#action_12447990 ] 
            
Michael Busch commented on LUCENE-573:
--------------------------------------

Sorry, it took me a while to take care of this patch.

You are right, my patch only prevents the ParseException to be thrown. However, it is still not possible to search for a phrase query that contains quotes.

I think the simple solution is to call discardEscapeChar(String) for the phrase string. Then *all* escaped characters within a phrase become unescaped.

Now the question is again (Yonik raised it already): Do we want this behavior or do we rather want to maintain backward compatibility for already existing phrase queries that include a backslash? If we prefer compatibility over consistency then one solution would be to add a new method discardEscapeChar(String, char[]) that only unescapes certain characters, in this case " and \.

If we can make a decision here I'm happy to provide a new patch.

> Escaped quotes inside a phrase cause a ParseException
> -----------------------------------------------------
>
>                 Key: LUCENE-573
>                 URL: http://issues.apache.org/jira/browse/LUCENE-573
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: QueryParser
>    Affects Versions: 1.9
>         Environment: Debian Sarge, Sun JDK 1.4.2
>            Reporter: Tomislav Gountchev
>            Priority: Minor
>         Attachments: escaped_quotes_inside_phrases.patch
>
>
> QueryParser cannot handle escaped quotes when inside a phrase. Escaped quotes not in a phrase are not a problem. This can be added to TestQueryParser.testEscaped() to demonstrate the issue - the second assert throws an exception:
> assertQueryEquals("a \\\"b c\\\" d", a, "a \"b c\" d");
> assertQueryEquals("\"a \\\"b c\\\" d\"", a, "\"a \"b c\" d\"");
> See also this thread:
> http://www.nabble.com/ParseException-with-escaped-quotes-in-a-phrase-t1647115.html

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