Roman Slyusarchuk

> @ko3a4ok We should also remove the transaction.begin call at [line](https://github.com/googleapis/nodejs-spanner/blob/588c1a2e0c449cfcb86cac73da32dd5794ee2baa/src/transaction-runner.ts#L197) and add the appropriate test cases for the same. @surbhigarg92, unfortunately, if we just remove it, the explicit beginTransaction...

> @ko3a4ok I believe we are missing 2 use cases for Inline BeginTransaction implementation. > > 1. Mutation - Consider a transaction which contains only mutation operations. In that case,...

> > Regarding 1.: in this case, we should not create any transaction at all because `CommitRequest` will include singleUseTransaction parameter, and `transactionId` will be empty. This is how it...