[Spark] Introduce the DeltaTransaction trait #4100
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Which Delta project/connector is this regarding?
Description
The
OptimisticTransactionImpltrait is bloating as more features are added, making it difficult to extend from. This PR introducesDeltaTransaction, which is conceptually more general to support other implementations of the transaction, containing minimal number of fields that are essential for a transaction and necessary for the post-commit hooks.How was this patch tested?
unit test
Does this PR introduce any user-facing changes?
no