jpountz commented on PR #14932:
URL: https://github.com/apache/lucene/pull/14932#issuecomment-3087240130
@aylonsk To handle backward compatibility, I'd recommend doing the following:
- Add a new version constant to the format class, something like
`VERSION_GROUP_VARINT = 1; VERSION_CURRENT = VERSION_GROUP_VARINT`.
- Add a `int version` parameter to a pkg-private constructor of this format.
- Pass this version to the writer, write it in the codec header, and update
the writer to use group varint when version >= 1, and vint otherwise.
- Make the reader read the version from the codec header, use group varint
when version >= 1, and vint otherwise.
- Copy `TestLucene99HnswVectorsFormat` into a new test case that exercises
version=VERSION_START.
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