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chore(spanner): preserving lock order - R/W mux session (#3348)
This PR introduces changes to support the lock order preservation protocol for multiplexed sessions in read/write transactions. According to this protocol, when a read/write transaction on a multiplexed session is retried, the transaction ID from the previous abort must be passed when creating a new transaction. This ensures that the retried transaction is recognized as older, rather than being treated as a new one. The transaction context object is structured as follows, ``` txn { transactionId: The transaction ID. previousTransactionId: The transaction ID of the most recently failed transaction. } ```
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