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https://issues.apache.org/jira/browse/LUCENE-10291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17469390#comment-17469390
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ASF subversion and git services commented on LUCENE-10291:
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Commit 738247e78d1d5ff22f3755d0ceca8ad99d4f69f4 in lucene's branch
refs/heads/branch_9x from Yannick Welsch
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=738247e ]
LUCENE-10291: Only read/write postings when there is at least one indexed field
(#539)
> 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
> Fix For: 9.1
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> 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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