Yes, you could probably use the Cloud Dataflow connector.
The Cloud Dataflow connector for Cloud Spanner lets you read data from and write data to Cloud Spanner in a Cloud Dataflow pipeline, optionally transforming or modifying the data.
You can also create pipelines that transfer data between Cloud Spanner and other Google Cloud Platform products.
The Cloud Dataflow connector is the recommended method for efficiently moving data into and out of Cloud Spanner in bulk.
For usage and other details refer to https://cloud.google.com/spanner/docs/dataflow-connector
Hope it works!!
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