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https://issues.apache.org/jira/browse/LUCENE-4673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548854#comment-13548854
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Robert Muir commented on LUCENE-4673:
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quotes have a particular meaning to the queryparser so adding quotes would
change things.
In general queries' toString is just to be user-readable, not "re-parsable".
They don't escape syntax character and so on.
> TermQuery.toString() doesn't play nicely with whitespace
> --------------------------------------------------------
>
> Key: LUCENE-4673
> URL: https://issues.apache.org/jira/browse/LUCENE-4673
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 4.0-BETA, 4.1, 3.6.2
> Reporter: Itamar Syn-Hershko
>
> A TermQuery where term.text() contains whitespace outputs incorrect string
> representation: field:foo bar instead of field:"foo bar". A "correct"
> representation is such that could be parsed again to the correct Query object
> (using the correct analyzer, yes, but still).
> This may not be so critical, but in our system we use Lucene's QP to parse
> and then pre-process and optimize user queries. To do that we use
> Query.toString on some clauses to rebuild the query string.
> This can be easily resolved by always adding quote marks before and after the
> term text in TermQuery.toString. Testing to see if they are required or not
> is too much work and TermQuery is ignorant of quote marks anyway.
> Some other scenarios which could benefit from this change is places where
> escaped characters are used, such as URLs.
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