JingsongLi opened a new pull request, #9004:
URL: https://github.com/apache/paimon/pull/9004

   ## Purpose
   
   Keep index manifests written by the current Paimon version readable by older 
Paimon releases.
   
   ## Changes
   
   - Keep `IndexManifestEntrySerializer` at version 1 instead of writing 
version 2.
   - Read `sourceMeta` as an optional schema field while preserving the legacy 
five-field global-index schema.
   - Add a regression test that reads a newly written index manifest with the 
legacy schema.
   
   ## Root cause
   
   The serializer version is persisted in every index manifest entry. Older 
Paimon versions only accept version 1, so entries written with version 2 are 
rejected before schema evolution can handle the optional field.
   
   ## Tests
   
   - `mvn -pl paimon-core -DwildcardSuites=none 
-Dtest=IndexManifestEntrySerializerTest,IndexManifestFileHandlerTest test`
   - 13 tests passed; checkstyle, spotless, and enforcer passed.


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