Ferenczi Jim created LUCENE-7276:
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Summary: Add an optional reason to the MatchNoDocsQuery
Key: LUCENE-7276
URL: https://issues.apache.org/jira/browse/LUCENE-7276
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Reporter: Ferenczi Jim
Priority: Minor
It's sometimes difficult to debug a query that results in a MatchNoDocsQuery.
The MatchNoDocsQuery is always rewritten in an empty boolean query.
This patch adds an optional reason and implements a weight in order to keep
track of the reason why the query did not match any document. The reason is
printed on toString and when an explanation for noMatch is asked.
For instance the query:
new MatchNoDocsQuery("Field not found").toString()
=> 'MatchNoDocsQuery["field 'title' not found"]'
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