Adrien Grand created LUCENE-10291:
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Summary: 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
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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