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Posted to dev@lucene.apache.org by "Bruno Roustant (JIRA)" <ji...@apache.org> on 2019/07/09 08:09:00 UTC

[jira] [Commented] (LUCENE-8906) Lucene50PostingsReader.postings() casts BlockTermState param to private IntBlockTermState

    [ https://issues.apache.org/jira/browse/LUCENE-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16881037#comment-16881037 ] 

Bruno Roustant commented on LUCENE-8906:
----------------------------------------

This issue has been encountered in LUCENE-8753 (Uniform Split posting format).

> Lucene50PostingsReader.postings() casts BlockTermState param to private IntBlockTermState
> -----------------------------------------------------------------------------------------
>
>                 Key: LUCENE-8906
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8906
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/codecs
>            Reporter: Bruno Roustant
>            Priority: Major
>
> Lucene50PostingsReader is the public API that offers the postings() method to read the postings. Any PostingFormat can use it (as well as Lucene50PostingsWriter) to read/write postings.
> But the postings() method asks for a (public) BlockTermState param which is internally cast to the private IntBlockTermState. This BlockTermState is provided by Lucene50PostingsReader.newTermState().
> public PostingsEnum postings(FieldInfo fieldInfo, BlockTermState termState, PostingsEnum reuse, int flags)
> This actually makes impossible to a custom PostingFormat customizing the Block file structure to use this postings() method by providing their (Int)BlockTermState, because they cannot access the FP fields of the IntBlockTermState returned by PostingsReaderBase.newTermState().
> Proposed change:
>  * Either make IntBlockTermState public, as well as its fields.
>  * Or replace it by an interface in the postings() method. In this case the IntBlockTermState fields currently accessed directly would be replaced by getter/setter.



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