schemastore: support ActionCreateMaterializedView (#4779)

[lidezhu]

What problem does this PR solve?

Issue Number: close #5183

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[gemini-code-assist]

Code Review

This pull request introduces support for tracking materialized views and handling their out-of-place refresh cutovers. Key changes include adding methods to retrieve materialized view IDs, updating table trigger DDL event fetching to track materialized view lineages, and introducing a local DDL event type for cutovers in the filter package. The review feedback highlights two important issues: first, mutating the trackedMaterializedViewIDs map in-place during event fetching makes the operation non-idempotent and can lead to silently skipped events on retries; second, a potential nil pointer dereference exists when accessing the database map in loadMaterializedViewIDsAtTs without verifying if the schema ID is present.

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[lidezhu]

/gemini summary

[gemini-code-assist]

Summary of Changes

This pull request enables TiCDC to support the ActionCreateMaterializedView DDL operation. It integrates the necessary logic to persist these events, ensures they are correctly handled by the schema store, and updates the filtering framework to accommodate materialized view refresh operations. These changes ensure that materialized views are properly tracked and processed within the replication pipeline.

Highlights

• Materialized View Support: Added support for the ActionCreateMaterializedView DDL operation within the TiCDC schema store.
• DDL Handling and Persistence: Implemented necessary DDL handlers and persistence logic to correctly process and store materialized view creation events.
• Filtering Logic: Updated the filtering system to support the new EventTypeMViewRefreshOutOfPlaceCutover event type.
• Testing: Added comprehensive unit tests to verify the handling of materialized view DDLs and their interaction with the schema store.

New Features

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Activity

• Pull request created by lidezhu.
• Automated bot comments regarding CI and approval requirements.
• Review comments received from gemini-code-assist regarding idempotency and potential nil pointer dereferences.

[gemini-code-assist]

Summary of Changes

This pull request introduces support for ActionCreateMaterializedView within the schema store, ensuring that materialized view creation events are correctly persisted and handled. It also includes updates to the DDL filtering logic to accommodate materialized view-specific events, such as out-of-place refresh cutovers, and adds robust unit testing to verify these new capabilities.

Highlights

• Materialized View Support: Added support for ActionCreateMaterializedView in the schema store to correctly process and persist materialized view creation DDLs.
• Code Refactoring: Refactored loadAllPhysicalTablesAtTs to use a dedicated tablesAtTsState struct, improving code maintainability and readability.
• DDL Filtering Enhancements: Updated DDL filtering logic to support materialized view-specific events, including custom handling for refresh cutover events.
• Resource Management: Ensured proper resource cleanup by adding storageSnap.Close() calls in error handling paths within persistent storage.
• Testing: Added comprehensive unit tests to verify materialized view DDL handling, filtering, and schema store integration.

New Features

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Activity

• The pull request was initially created as a draft, skipping CI.
• The pull request is currently marked as not approved.
• CodeRabbit skipped the automated review due to branch settings.
• Author lidezhu requested a summary of the pull request.
• Gemini-code-assist provided feedback regarding idempotency in FetchTableTriggerDDLEvents and a potential nil pointer dereference in schema processing.