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