[hibernate-issues] [JIRA] (HSEARCH-3974) Backend-specific extensions for scroll

[Yoann Rodière (JIRA)]

Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b ) *created* an issue

Hibernate Search ( https://hibernate.atlassian.net/browse/HSEARCH?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 ) / New Feature ( https://hibernate.atlassian.net/browse/HSEARCH-3974?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 ) HSEARCH-3974 ( https://hibernate.atlassian.net/browse/HSEARCH-3974?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 ) Backend-specific extensions for scroll ( https://hibernate.atlassian.net/browse/HSEARCH-3974?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 )

Issue Type: New Feature Assignee: Unassigned Components: backend-elasticsearch, backend-lucene Created: 30/Jul/2020 09:03 AM Fix Versions: 6.0.0.Beta-backlog Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b )

See item 12 in HSEARCH-3323:

> 
> 
> 
> Allow backends to extend the SearchScroll interfaces, like they currently
> do with SearchQuery ( ElasticsearchSearchQuery , LuceneSearchQuery ):
> 
> * Add a generic parameter S extends SearchScroll<H> to ExtendedSearchFetchable
> and override its scroll methods to return that type.
> * Adapt the interfaces that extend ExtendedSearchFetchable as necessary.
> * Create a new ExtendedSearchScroll<H> interface using the same principle.
> 
> * Create specific interfaces for Elasticsearch and Lucene: ElasticsearchSearchScroll
> and LuceneSearchScroll.
> * Implement these interfaces where appropriate.
> * Test extensions for Lucene and Elasticsearch. Mainly, check that the
> scroll has the correct type. See how it's done for SearchResult in org.hibernate.search.integrationtest.backend.elasticsearch.ElasticsearchExtensionIT#query
> .
> 

Optionally, we may also handle item 8, but let's discuss it together on Zulip first:

> 
> 
> 
> Add Lucene-specific extensions to Scrolling
> 
> * This is mainly necessary for Infinispan
> * Expose a way to force Lucene to extract TopDocs up to a specific index
> and retrieve them: LuceneSearchScroll#preloadTopDocsUpTo(), returns TopDocs
> 
> * Expose a way to load a specific document specified by its index: LuceneSearchScroll#loadHitByIndex(),
> returns H
> * Maybe we can improve on that later; ideally Infinispan should load
> multiple hits in one call ( LuceneSearchScroll#loadHitsByIndex(int ...),
> returns List<H> ) otherwise the cost of creating collectors for each
> retrieved hit will be a bit too much.
> 

( https://hibernate.atlassian.net/browse/HSEARCH-3974#add-comment?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 ) Add Comment ( https://hibernate.atlassian.net/browse/HSEARCH-3974#add-comment?atlOrigin=eyJpIjoiNzA2MDQ5ZDZiNmMwNDA1M2I3YTY3YTg1NzZiNjE1ZDEiLCJwIjoiaiJ9 )

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