[FLINK-38045] Build createTableEventCache using TableSchemas from split and Make transform operator stateless#4056
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...cdc/src/main/java/org/apache/flink/cdc/connectors/mysql/source/reader/MySqlSourceReader.java
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...ime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/PreTransformOperator.java
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…it and Make transform operator stateless (apache#4056) Co-authored-by: wuzexian <shanqing.wzx@alibaba-inc.com>
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For historical reasons, the current implementation does not utilize the Source to build a schema cache. This requires the TransformOperator to maintain its own complex state.
An optimization is proposed: to build a reusable schema cache at the Source (or in an operator immediately following it).
The primary benefit of this approach is that the transform operator can be made completely stateless. This simplifies its design, improves architectural modularity, and makes the entire pipeline more robust and maintainable.