[GitHub] [incubator-doris] whutpencil commented on pull request #7301: [Function] Add Function date_trunc() doc and FE test case

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whutpencil commented on pull request #7301:
URL: https://github.com/apache/incubator-doris/pull/7301#issuecomment-986102468


   > Hi @whutpencil , thanks for your contribution. But you have implement the function on BE side (required) and FE side(Optional), or the query may crash during the execution.
   > 
   > The FE side implementation of a function is just for calculating the function result with all constant parameters. such as `date_trunc('2010-12-02 19:28:30', 'year');`, but is we call `date_trunc(column1, 'year');`, it has to be executed on BE side.
   > 
   > But if you wish, you can just pull your FE side implementation, and see if someone can help you to impement the BE side based on your FE side implementation.
   
   Thank you for your explanation. My FE implementation has been attached. This is my first time to submit PR, hoping to make some contributions to the Doris community. The logic of this function is not complex, so I hope someone can implement the BE end as soon as possible.
   
   After then we can remove the word "developing" from the doc.


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