[jira] [Resolved] (LUCENE-8489) Provide List type constructors for BaseCompositeReader based Readers

["Michael Sokolov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Sokolov resolved LUCENE-8489.
-------------------------------------
    Resolution: Won't Fix

The discussion ended up deciding not to go forward , so I'm resolving the issue.

> Provide List type constructors for BaseCompositeReader based Readers
> --------------------------------------------------------------------
>
>                 Key: LUCENE-8489
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8489
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Namgyu Kim
>            Priority: Major
>              Labels: usability
>         Attachments: LUCENE-8489.patch
>
>
> Currently, Reader based on BaseCompositeReader(MultiReader, ParallelCompositeReader, DirectoryReader) does not support List type constructor.
> In fact, this does not make a big difference in performance, but users will think positively if the API supports more variants.
> I will add the following to support this.
> 1) MultiReader
> {code:java}
> public MultiReader(List<IndexReader> subReaders) throws IOException {
>   this(subReaders, true);
> }
> public MultiReader(List<IndexReader> subReaders, boolean closeSubReaders) throws IOException {
>   this(subReaders.toArray(new IndexReader[0]), closeSubReaders);
> }
> {code}
> 2) ParallelCompositeReader
> {code:java}
> public ParallelCompositeReader(List<CompositeReader> readers) throws IOException {
>   this(true, readers);
> }
> public ParallelCompositeReader(boolean closeSubReaders, List<CompositeReader> readers) throws IOException {
>   this(closeSubReaders, readers, readers);
> }
> public ParallelCompositeReader(boolean closeSubReaders, List<CompositeReader> readers, List<CompositeReader> storedFieldReaders) throws IOException {
>   this(closeSubReaders, readers.toArray(new CompositeReader[0]), storedFieldReaders.toArray(new CompositeReader[0]));
> }
> {code}
> 3) DirectoryReader
> {code:java}
> protected DirectoryReader(Directory directory, List<LeafReader> segmentReaders) throws IOException {
>   super(segmentReaders);
>   this.directory = directory;
> }
> {code}
> 4) BaseCompositeReader
> {code:java}
> @SuppressWarnings("unchecked")
> protected BaseCompositeReader(List<R> subReaders) throws IOException {
>   this(subReaders.toArray((R[]) new IndexReader[subReaders.size()]));
> }
> {code}
> 5) Test
>  I wrote a test case in "TestParallelCompositeReader".
> If you have any questions or requests, please left any comments :D



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