y0908105023 opened a new pull request, #20901:
URL: https://github.com/apache/flink/pull/20901

   What is the purpose of the change
   Add date_add sql function support
   
   Brief change log
   date_add
   
   add sql function date_add to BuiltInFunction
   
   Verifying this change
   Please make sure both new and modified tests in this PR follows the 
conventions defined in our code quality guide: 
https://flink.apache.org/contributing/code-style-and-quality-common.html#testing
   
   This change is already covered by existing tests, such as (please describe 
tests).
   
   ScalarFunctionsTest#testDateTypeAdd
   
   ScalarFunctionsTest#testDateTypeMinus
   
   Does this pull request potentially affect one of the following parts:
   Dependencies (does it add or upgrade a dependency): (yes / no)
   The public API, i.e., is any changed class annotated with @Public(Evolving): 
(yes / no)
   The serializers: (yes / no / don't know)
   The runtime per-record code paths (performance sensitive): (yes / no / don't 
know)
   Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
   The S3 file system connector: (yes / no / don't know)
   It does not affect any parts
   
   Documentation
   Does this pull request introduce a new feature? (yes / no)
   If yes, how is the feature documented? (not applicable / docs / JavaDocs / 
not documented)
   No


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