Smarter deployments in Tinybird: faster schema changes for the most common operations

Tinybird has improved its deployment process by introducing ALTER TABLE support for schema changes on ClickHouse® tables, significantly speeding up deployment times by applying more efficient operations instead of full table rebuilds. Previously, any change such as adding a column or modifying a TTL required creating a new table, backfilling data, and swapping tables, which was slow for large tables with streaming ingestion. The new process classifies changes into four categories: NoChange, MetadataOnly, AlterOperation, and Schema, where only AlterOperations use ALTER TABLE to make changes without data movement or backfill, reducing deployment time from minutes to seconds for large tables. However, more complex changes still require the original, full rebuild process. The system also includes safety checks to ensure no data loss or query disruptions occur during deployments, and it generates rollback queries for any ALTER operations, maintaining the reliability and efficiency of database management.

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