fanaticjo opened a new pull request #3035:
URL: https://github.com/apache/hudi/pull/3035


   ## *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
   If anyone wants to use custom upsert logic then they have to override the 
Latest avro payload class which is only possible in java or scala . 
   
   Python developers have no such option . 
   
   Will be introducing a new payload class and a new key which can work in java 
, scala and python 
   
   This class will be responsible for custom upsert logic and a new key 
hoodie.update.key which will accept the columns which only need to be updated 
   
    
   
   "hoodie.update.keys": "admission_date,name",  #comma seperated key 
   "hoodie.datasource.write.payload.class": "com.hudiUpsert.hudiCustomUpsert" 
#custom upsert key 
   
    
   
   so this will only update the column admission_date and name in the target 
table 
   
   
   
   ## Brief change log
   
   *(for example:)*
     - added 
hudi-common/src/main/java/org/apache/hudi/common/model/OverwriteWithCustomAvroPayload.java
   
   ## Verify this pull request
   
   *(Please pick either of the following options)*
   
   This pull request is a trivial rework / code cleanup without any test 
coverage.
   
   *(or)*
   
   This pull request is already covered by existing tests, such as *(please 
describe tests)*.
   
   (or)
   
   This change added tests and can be verified as follows:
   
   *(example:)*
   
   
     - *Manually verified the change by running a job locally.*
   
   ## Committer checklist
   
    - [ ] 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


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