JingsongLi commented on PR #8818:
URL: https://github.com/apache/paimon/pull/8818#issuecomment-5104616465

   The feature “automatically refresh the old vector index once after an 
upgrade” has not yet been implemented**. The old index lacks `sourceMeta`, so 
the current planner skips it entirely; however, the range planner treats the 
old index as overwritten, so it is neither rebuilt nor included in the 
incremental refresh. New tests even explicitly assert that the old index “does 
not automatically refresh,” which contradicts the PR description and previous 
feedback. It is recommended that this change not be merged for now.


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