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https://issues.apache.org/jira/browse/LUCENE-5336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820091#comment-13820091
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Adrien Grand commented on LUCENE-5336:
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Javadocs and code seem to disagree on the default operator: javadocs say {{The
default operator is AND if no other operator is specified.}} while the code has
{{private BooleanClause.Occur defaultOperator = BooleanClause.Occur.SHOULD;}}?
Otherwise I agree with Mike that this new query parser is awesome. I will
certainly use it!
> Add a simple QueryParser to parse human-entered queries.
> --------------------------------------------------------
>
> Key: LUCENE-5336
> URL: https://issues.apache.org/jira/browse/LUCENE-5336
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jack Conradson
> Attachments: LUCENE-5336.patch, LUCENE-5336.patch
>
>
> I would like to add a new simple QueryParser to Lucene that is designed to
> parse human-entered queries. This parser will operate on an entire entered
> query using a specified single field or a set of weighted fields (using term
> boost).
> All features/operations in this parser can be enabled or disabled depending
> on what is necessary for the user. A default operator may be specified as
> either 'MUST' representing 'and' or 'SHOULD' representing 'or.' The
> features/operations that this parser will include are the following:
> * AND specified as '+'
> * OR specified as '|'
> * NOT specified as '-'
> * PHRASE surrounded by double quotes
> * PREFIX specified as '*'
> * PRECEDENCE surrounded by '(' and ')'
> * WHITESPACE specified as ' ' '\n' '\r' and '\t' will cause the default
> operator to be used
> * ESCAPE specified as '\' will allow operators to be used in terms
> The key differences between this parser and other existing parsers will be
> the following:
> * No exceptions will be thrown, and errors in syntax will be ignored. The
> parser will do a best-effort interpretation of any query entered.
> * It uses minimal syntax to express queries. All available operators are
> single characters or pairs of single characters.
> * The parser is hand-written and in a single Java file making it easy to
> modify.
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