[jira] [Created] (FLINK-27849) Harden correctness for non-deterministic updates present in the changelog pipeline

["lincoln lee (Jira)" <ji...@apache.org>]

lincoln lee created FLINK-27849:
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             Summary: Harden correctness for non-deterministic updates present in the changelog pipeline
                 Key: FLINK-27849
                 URL: https://issues.apache.org/jira/browse/FLINK-27849
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Runtime
         Environment: There commonly exists updates(which means not only RowKind.INSERT messages) in a streaming pipeline, then wrong results or error may occurs when use some non-deterministic functions or operations.

It is a long lived issue since the first day that flink sql was available in streaming, but it still not totally be eliminated though some efforts have been taken. 

We should detect all the non-deterministic operations in the changelog pipelines, raise an error to tell users the risk and also add an mechanism that can process such a issue  if a user is willing to pay some cost(probably introduce the state).

All non-deterministic operations include builtin temporal functions(now, current_timestamp...), UUID, RAND... 
or user defined non-deterministic functions (override isDeterministic return false)
or a lookup join on a lookup source which data may change over time
            Reporter: lincoln lee
             Fix For: 1.16.0






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