buptljy opened a new pull request #10120: [FLINK-14646] Check non-null for key in KeyGroupStreamPartitioner URL: https://github.com/apache/flink/pull/10120 ## What is the purpose of the change Add non-null check for key in KeyGroupStreamPartitioner because the NPE message thrown is not friendly to users. ## Brief change log ## Verifying this change ## Does this pull request potentially affect one of the following parts: ## Documentation
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