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https://issues.apache.org/jira/browse/LUCENE-10291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454041#comment-17454041
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Robert Muir commented on LUCENE-10291:
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I agree, it would be good to have simple tests for each of these features
"empty" behavior somehow.
AFAIK there is a PerFieldVectors and PerDocvaluesFormat too, which could be
hide the same issues for those formats...
> Only read/write postings when there is at least one indexed field
> -----------------------------------------------------------------
>
> Key: LUCENE-10291
> URL: https://issues.apache.org/jira/browse/LUCENE-10291
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
>
> Unlike points, norms, term vectors or doc values which only get written to
> the directory when at least one of the fields uses the data structure,
> postings always get written to the directory.
> While this isn't hurting much, it can be surprising at times, e.g. if you
> index with SimpleText you will have a file for postings even though none of
> the fields indexes postings. This inconsistency is hidden with the default
> codec due to the fact that it uses PerFieldPostingsFormat, which only
> delegates to any of the per-field codecs if any of the fields is actually
> indexed, so you don't actually get a file if none of the fields is indexed.
> We noticed this behavior by creating a codec that throws
> UnsupportedOperationException for postings since it's not expected to have
> postings, and it always fails writing or reading data. While it's easy to
> work around this issue on top of Lucene by using a dummy postings format, it
> would be better to fix Lucene to handle postings consistently with other data
> structures?
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