aloyszhang edited a comment on issue #8075: [FLINK-12043][core] Process unreadble NPE without any hint URL: https://github.com/apache/flink/pull/8075#issuecomment-479601262 I agree with "Even without them, when you get an NPE you can already infer that one of the incoming elements was likely null", but anyway, I think it's more clear and easier to understand with these hints.
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