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https://issues.apache.org/jira/browse/LUCENE-7821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009774#comment-16009774
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ASF subversion and git services commented on LUCENE-7821:
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Commit e11bc030987b33faadf42f0b2fb21d521077f361 in lucene-solr's branch
refs/heads/master from [~steve_rowe]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=e11bc03 ]
LUCENE-7821: The classic and flexible query parsers, as well as Solr's
'lucene'/standard query parser, should require ' TO ' in range queries, and
accept 'TO' as endpoints in range queries.
> Classic, flexible, and Solr's standard/"lucene" query parsers: range queries
> should require " TO ", and accept TO as range endpoints
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-7821
> URL: https://issues.apache.org/jira/browse/LUCENE-7821
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Hoss Man
> Assignee: Steve Rowe
> Attachments: LUCENE-7821.patch, LUCENE-7821.patch
>
>
> A post on the solr-user mailing list drew my attention to the fact that this
> is apparently a valid range query under the QueryParser.jj grammer (both for
> the classic parser and the solr variant -- i didn't check flexible)...
> {noformat}
> [x z] // parsed the same as [x TO z]
> {noformat}
> it's parsed as a valid range query even though there is no {{ TO }} -- even
> though there is nothing in the docs to suggest that the {{ TO }} is intended
> to be optional.
> Furthermore, in my experimenting i realized that how the grammer looks for
> the {{ TO }} keyword seems to be a bit sloppy, making some range queries that
> should be easy to validate (because they are unambiguous) fail to parse...
> {noformat}
> [TO TO z] // fails
> [a TO TO] // fails
> [a TO "TO"] // works, but why should quoting be neccessary here?
> {noformat}
> ----
> If the "sloppy" parsing behavior is intentional, then the docs should reflect
> that the {{ TO }} is optional -- but it seems like in general we should make
> these other unambiguous cases parse cleanly.
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