Karl-WangSK opened a new pull request #2056:
URL: https://github.com/apache/hudi/pull/2056


   ## *Tips*
   - *Thank you very much for contributing to Apache Hudi.*
   - *Please review https://hudi.apache.org/contributing.html before opening a 
pull request.*
   
   ## What is the purpose of the pull request
   
   Add new Payload(OverwriteMulColAvroPayload) for updating specified fields in 
storage
   
   ## Brief change log
   
   update current value for several fields that you want to change.
   
   The default payload OverwriteWithLatestAvroPayload overwrite the whole 
record when 
   
   compared to orderingVal.This doesn't meet our need when we just want to 
change specified fields.
   For example: (suppose Default value is null)
   ```
   current Value 
   Field:      name   age   gender
   Value:     karl     20    male
   ```
   ```
   insert Value
   Field:      name   age   gender
   Value:     null     30    null
   ```
   ```
   After insert:
   Field:      name   age   gender
   Value:     karl     30    male
   ```
   ## Verify this pull request
   
   Added TestOverwriteMulColAvroPayload to verify the change.
   
   ## Committer checklist
   
   - [x]  Has a corresponding JIRA in PR title & commit
   
    - [ ] Commit message is descriptive of the change
    
    - [ ] CI is green
   
    - [ ] Necessary doc changes done or have another open PR
          
    - [ ] For large changes, please consider breaking it into sub-tasks under 
an umbrella JIRA.


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