[jira] [Created] (LUCENE-9616) Improve test coverage for internal format versions

["Julie Tibshirani (Jira)" <ji...@apache.org>]

Julie Tibshirani created LUCENE-9616:
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             Summary: Improve test coverage for internal format versions
                 Key: LUCENE-9616
                 URL: https://issues.apache.org/jira/browse/LUCENE-9616
             Project: Lucene - Core
          Issue Type: Test
            Reporter: Julie Tibshirani


Some formats use an internal versioning system -- for example {{CompressingStoredFieldsFormat}} maintains older logic for reading an on-heap fields index. Because we always allow reading segments from the current + previous major version, some users still rely on the read-side logic of older internal versions.

Although the older version logic is covered by TestBackwardsCompatibility, it looks like it's not exercised in unit tests. Older versions aren't "in rotation" when choosing a random codec for tests. They also don't have dedicated unit tests as we have for separate older formats, for example {{TestLucene60PointsFormat}}.

It could be good to improve unit test coverage for the older versions, since they're in active use. A downside is that it's not straightforward to add unit tests, since we tend to just change/ delete the old write-side logic as we bump internal versions.



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