sink: Add schema/table routing support for mysql and redo sinks

[a-cong]

What problem does this PR solve?

Issue Number: close #3700

What is changed and how it works?

Porting changes from pingcap/tiflow#12435 to new ticdc architecture.

The dispatchers config is the same as in tiflow -

[[sink.dispatchers]]
matcher = ["uds_000.*"]
schema = "tidb_failover_test"
table = "{table}"

[[sink.dispatchers]]
matcher = ["oyster_production.*"]
schema = "oyster_production"
table = "{table}"

We also add the TargetSchema and TargetTable fields to the TableName struct. Since there is now a shared TableInfo object that can be accessed by multiple changefeeds and a new concept of Dispatcher objects, we clone the TableInfo in each dispatcher with the routing information for that table in handleHandshakeEvent (which is executed when the dispatcher starts), and then store that cloned/routed TableInfo for the dispatcher. Subsequent DMLs then look up the stored info. Subsequent DDLs also explicitly update routing in handleSingleDataEvents.

Another difference between ticdc and tiflow is that DDLs are now handled per-sink instead of in one single entry point. Because of this, we need to apply routing in both the mysql and redo sinks separately - the shared rewriting functionality is in pkg/sink/util/ddl_routing.go.

We also copied FetchDDLTables and RenameDDLTable (and the corresponding tests) from https://github.com/pingcap/tiflow/blob/master/dm/pkg/parser/common.go so we could use them to rewrite DDLs.

Check List

Tests

• Unit tests
• Integration tests
• Manual test - deployed to internal dev cluster and bootstrapped a migration shadow with schema mapping, verified changefeed routes DDLs/DMLs correctly

Questions

Do you need to update user documentation, design documentation or monitoring documentation?

Yes - will do so in separate PR

Release note

Added support for schema and table routing for mysql-compatible sinks by extending the `dispatchers` config

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[ti-chi-bot]

Hi @a-cong. Thanks for your PR.

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[pingcap-cla-assistant]

All committers have signed the CLA.

[gemini-code-assist]

Summary of Changes

Hello @a-cong, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the data replication capabilities by introducing schema and table routing for MySQL-compatible and Redo sinks. It allows users to dynamically remap database and table names from the source to the target, providing greater flexibility for data integration and consolidation. The changes involve updating configuration structures, implementing DDL query rewriting logic, and ensuring concurrency safety through event cloning, ultimately enabling seamless replication to custom target schemas and tables.

Highlights

• Schema and Table Routing for MySQL and Redo Sinks: Introduces comprehensive support for schema and table routing, allowing users to define rules to map source database and table names to different target names in MySQL-compatible and Redo sinks. This enables flexible data migration and consolidation scenarios.
• DDL Query Rewriting: Implements a mechanism to parse and rewrite DDL (Data Definition Language) queries based on configured routing rules. This ensures that DDL statements like CREATE TABLE, ALTER TABLE, and RENAME TABLE are executed against the correct target schema and table names in the downstream.
• Event Cloning for Concurrency Safety: Adds cloning logic for BatchDMLEvent and DDLEvent objects before applying routing. This prevents race conditions and unintended mutations when the same event is processed by multiple dispatchers (e.g., the main event dispatcher and the redo log dispatcher), ensuring each can apply routing independently.
• Enhanced TableName and TableInfo: Extends the TableName struct with TargetSchema and TargetTable fields to store routed names. The TableInfo struct now includes a CloneWithRouting method to create a routed copy, and DML SQL generation functions (buildInsert, buildDelete, buildUpdate) are updated to use these target names.
• Integration with Redo Log Replay: Ensures that DDL routing is applied before writing events to the redo log. This means that when redo logs are replayed (e.g., during disaster recovery), the DDLs will correctly target the routed schema and table names, maintaining data consistency.

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[gemini-code-assist]

Code Review

This pull request introduces a significant new feature: schema and table routing for MySQL and redo log sinks. The changes are extensive, touching upon the API, configuration, dispatchers, and sinks to support this functionality. The design thoughtfully addresses potential concurrency issues by cloning event objects to prevent race conditions, especially when events are shared between the main sink and the redo log sink. A comprehensive set of unit and integration tests has been added to validate the new routing logic. Overall, this is a well-structured implementation of a complex feature. I've identified one critical issue in BatchDMLEvent.CloneForRouting that could lead to data corruption or mis-routing due to improper cloning of nested event objects. Please address this to ensure the correctness of the feature.

[wk989898]

/ok-to-test

[ti-chi-bot]

@a-cong: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-error-log-review	ebe04ba	link	true	/test pull-error-log-review
pull-unit-test	ebe04ba	link	true	/test pull-unit-test
pull-unit-test-next-gen	ebe04ba	link	false	/test pull-unit-test-next-gen

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