Luc Vanlerberghe created LUCENE-7078:
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Summary: Make remaining mutable Queries immutable
Key: LUCENE-7078
URL: https://issues.apache.org/jira/browse/LUCENE-7078
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Reporter: Luc Vanlerberghe
Priority: Minor
See LUCENE-6531
Mutable queries are an issue for automatic filter caching since modifying a
query after it has been put into the cache will corrupt the cache. We should
make all queries immutable (up to the boost) to avoid this issue.
Since they are part of the public API I would suggest splitting them in an
immutable class and a builder like was done for most other Queries *before*
releasing an official 6.x version
I did a quick scan through all derived classes of Query and I compiled the
following list (ignoring sources in test or contrib folders)
Some of them are already marked as experimental (but should perhaps receive the
"official" @lucene.experimental tag ?)
For some it's possibly not an issue since they should never end up in a filter
cache (like MoreLikeThisQuery ?), but then a comment specifying the exception
to the rule should perhaps be added.
* lucene/search:
** org.apache.lucene.search.MultiPhraseQuery
* lucene/queries:
** org.apache.lucene.queries.CommonTermsQuery
** org.apache.lucene.queries.CustomScoreQuery (marked as @lucene.experimental)
** org.apache.lucene.queries.mlt.MoreLikeThisQuery
* lucene/suggest:
** org.apache.lucene.search.suggest.document.ContextQuery (marked as
@lucene.experimental)
* lucene/facet:
** org.apache.lucene.facet.DrillDownQuery (marked as @lucene.experimental)
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