helanto opened a new pull request #3740:
URL: https://github.com/apache/hudi/pull/3740


   ## *Tips*
   - *Thank you very much for contributing to Apache Hudi.*
   - *Please review https://hudi.apache.org/contribute/how-to-contribute before 
opening a pull request.*
   
   ## What is the purpose of the pull request
   
   *The purpose of this PR is to provide a fix in the issue described in 
[ISSUE-3709](https://github.com/apache/hudi/issues/3709). Specifically, when 
using INSERT mode the library should not pre-combine input dataset if 
precombine is deactivated.*
   
   ## Brief change log
     - *Modify HoodieConcatHandle so it does not use an underlying Map to store 
incoming records. The Map is not really needed in this case; the key lookup is 
avoided, since merge is simply a concatenation of the old with new records.*
   
   ## Verify this pull request
   
   This change added tests and can be verified as follows:
   
     - *Added org.apache.hudi.functional.TestCOWDataSourceConsistentInserts to 
verify the change.*
   
   ## 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
          
    - [ ] For large changes, please consider breaking it into sub-tasks under 
an umbrella JIRA.
   


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