[Doc] How to develop the flink cdc pipeline

[cobolbaby]

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• [X] I searched in the issues and found nothing similar.

Motivation

If I want to extend the implementation of end-to-end data synchronization, such as from SQL Server to PostgreSQL, SQL Server to Greenplum, PostgreSQL to Greenplum, what interface methods need to be implemented? I haven't found any relevant documentation yet.

Solution

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Alternatives

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Anything else?

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Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!