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https://issues.apache.org/jira/browse/SOLR-8802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185738#comment-15185738
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Tomás Fernández Löbbe commented on SOLR-8802:
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I see. I just think this could protect people that writes plugins in Solr from
bugs difficult to track.
> Make remaining mutable Queries immutable
> ----------------------------------------
>
> Key: SOLR-8802
> URL: https://issues.apache.org/jira/browse/SOLR-8802
> Project: Solr
> Issue Type: Improvement
> 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.
> * solr/core:
> ** org.apache.solr.search.ExtendedQueryBase: Several derived classes, among
> which:
> ** org.apache.solr.query.FilterQuery
> ** org.apache.solr.query.SolrRangeQuery (marked as @lucene.experimental)
> ** org.apache.solr.search.RankQuery (marked in comment as experimental, but
> not its derived classes)
> ** org.apache.solr.search.WrappedQuery
> ** org.apache.solr.search.join.GraphQuery (marked as @lucene.experimental)
> ** org.apache.solr.search.SolrConstantScoreQuery (marked in comment as
> experimental, but not the derived FunctionRangeQuery)
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