Google Cloud Spanner
Core project: DataSourcesPluginsCore/SpannerDataSourceCore/. Class SpannerDataSource inherits RDBSource; category CLOUD, type Spanner.
Registration
DataSourceType:Spanner- Category:
CLOUD
Connection & auth
Instance, database, and Google credentials (often service account) map to connection properties. See Spanner authentication.
Capabilities
ANSI-style SQL with Spanner-specific DDL and limits; review SpannerDataSource.cs and shared RDBSource paths.