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Posted to issues@lucene.apache.org by "Alan Woodward (Jira)" <ji...@apache.org> on 2019/11/25 09:55:00 UTC

[jira] [Created] (LUCENE-9062) Extend QueryVisitor to support multi-term queries

Alan Woodward created LUCENE-9062:
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             Summary: Extend QueryVisitor to support multi-term queries
                 Key: LUCENE-9062
                 URL: https://issues.apache.org/jira/browse/LUCENE-9062
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Alan Woodward
            Assignee: Alan Woodward


Currently, QueryVisitor only allows queries to report that they consume a fixed set of terms.  For multi-term queries, however, they don't know which terms in an index they're going to match until rewrite time.  Current users of this API get round this by using instanceof checks in a `visitLeaf()` method, but this is clunky and does not adapt well to user-defined queries.

We should extend QueryVisitor so that queries can report that they consume a class of terms matching an automaton, in addition to individual terms.



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