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https://issues.apache.org/jira/browse/LUCENE-1819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744561#action_12744561
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Mark Miller commented on LUCENE-1819:
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bq. What are you thoughts about QueryParser being able to know about custom
Query implementations? E.g. if I were to write a MyQuery class and implemen the
toString method a certain way, how would QueryParser know about MyQuery?
Right - this has always been a limitation. That is why the wording has been
loosened a lot of the years in Query.toString(). There is really not a lot you
can do here - non of the SpanQuerys produce parsable toStrings because there is
no support for SpanQuerys in the QueryParser. I think a couple others do not
work either. I think its just got to be something we live with - you simply
can't count on it - but if possible, its nice I guess - especially for the core
queries.
bq. Is it possible to extend QueryParser?
Its possible to extend it, but not really syntax wise. The new QueryParser in
contrib will likely be more extensable in that regard in a way - though still
you would be building another parser - it would just hopefully allow for a lot
of non cut and paste reuse if you just want to add syntax (I think - I'm only
at the surface with the new QP).
Overall though, its not really a contract, because its not something users can
adhere to. Its more of an internal nicety suggestion - but if your not a Query
already in the QP, your out of luck anyway - at best you could toString to a
primitive query parsable String if your custom query rewrites to primitives.
> MatchAllDocsQuery.toString(String field) does not honor the javadoc contract
> ----------------------------------------------------------------------------
>
> Key: LUCENE-1819
> URL: https://issues.apache.org/jira/browse/LUCENE-1819
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.4.1
> Reporter: John Wang
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1819.patch
>
>
> Should be
> public String toString(String field){
> return "*:*";
> }
> QueryParser needs to be able to parse the String form of this query.
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