YannByron commented on PR #7648:
URL: https://github.com/apache/paimon/pull/7648#issuecomment-4325310052

   @kerwin-zk I have some thoughts which may be worth considering.
   1. These classes (`PaimonRelation`, `ScanPlanHelper`, `PaimonBatchWrite`, 
`AbstractPaimonSparkSqlExtensionsParser`, `PaimonStrategyHelper`, 
`PaimonCreateTableAsSelectStrategy` and `PaimonRelation`) maybe don't have to 
copy to `paimon-spark-4.0` cause these use the stable api. Please check.
   
   2. And For classes (`AssignmentAlignmentHelper`, `PaimonMergeIntoResolver`, 
`PaimonMergeIntoResolverBase`, `RewriteUpsertTable`, `MergeIntoPaimonTable`and 
`MergeIntoPaimonDataEvolutionTable`), can we identify specific 
incompatibilities and then draw them into 'SparkShim' to solve them?


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