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https://issues.apache.org/jira/browse/LUCENE-7277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284233#comment-15284233
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Dawid Weiss commented on LUCENE-7277:
-------------------------------------
While it may sound like a good idea to put some of the shared "equivalence
checks" in the superclass, it's actually the misleading part because, if left
as-is and not overridden in a subclass, it results in an incorrect behavior
(the query object is cached for all instances of the subclass).
If query hash/equals is so important (and it is), I'd make it an abstract
method to enforce proper override in all subclasses.
> Make Query.hashCode and Query.equals abstract
> ---------------------------------------------
>
> Key: LUCENE-7277
> URL: https://issues.apache.org/jira/browse/LUCENE-7277
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Trivial
>
> Custom subclasses of the Query class have the default implementation of
> hashCode/equals that make all instances of the subclass equal. If somebody
> doesn't know this it can be pretty tricky to debug with IndexSearcher's query
> cache on.
> Is there any rationale for declaring it this way instead of making those
> methods abstract (and enforcing their proper implementation in a subclass)?
> {code}
> public int hashCode() {
> return getClass().hashCode();
> }
> public boolean equals(Object obj) {
> if (obj == null)
> return false;
> return getClass() == obj.getClass();
> }
> {code}
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