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The Google Spanner materialization connector in Estuary delivers data from Estuary collections into tables in a Google Spanner database. It supports continuous materialization from real-time or batch pipelines and provides controls for table configuration, delete handling, and efficient key distribution.

• Materializes Estuary collections directly into Google Spanner tables
• Standard updates to keep destination records synchronized with Estuary collections
• Optional hard deletes so records deleted upstream can also be removed from Google Spanner
• Soft deletes by default, represented through _meta/op
• Configurable destination table names for individual bindings
• Alternative schema support for bindings that should use a non-default schema
• Custom SQL during table creation for additional table-level configuration
• Google Cloud service account authentication
• Built-in key distribution optimization that adds a hash prefix to table keys to distribute writes across Spanner splits and reduce hotspots
• Option to exclude the root Flow document from standard updates for advanced use cases

The connector’s key-distribution optimization is enabled by default to spread writes across Google Spanner splits and avoid concentrated write hotspots. It can be disabled through advanced configuration when the original key ordering is preferred.