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Common Primary Key Requirement for Join Tables: When executing a join operation, it is imperative to ensure that there is a common primary key between two or more data sources for matching purposes.

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Overview

In data pipelines built with Flink and CDC technologies, there is often a requirement to enrich data in real time by merging multiple tables into a single wide table. Consider the scenario with three interconnected tables A, B, and C, forming a join chain:

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By treating all data tables as dynamic dimension tables and considering all changes as signals to trigger data enrichment, we have successfully addressed the issues faced by the traditional lookup join method. Now, changes in any table can immediately trigger updates, ensuring data completeness and timeliness. This method provides an efficient and flexible solution for real-time data enrichment in data stream processing.

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Implementation

Compatibility, Deprecation, and Migration Plan

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