Version Retention

[GCP-ally]

I'm unable to import from a spanner-dump file. Spanner-cli throws and error when it tries to run the first block
ALTER DATABASE `example-db` SET OPTIONS ( version_retention_period = '7d' ); ); id STRING(1024), ) PRIMARY KEY(id);

[yfuruyama]

Thank you for reporting the issue.

ALTER DATABASE is not supported yet in spanner-cli, so that would be the reason it causes an error.

Let me fix spanner-cli to support ALTER DATABASE clause.