eldenmoon opened a new pull request, #17842:
URL: https://github.com/apache/doris/pull/17842

   … null values when slot is not null
   
   Before this PR when encountering null values with some columns which is 
specified as `NOT NULL`, null values will not be filtered,thi behavior does not 
match with the original load behavior. Second column alignment logic has bug :
   
   ```
   template <typename ColumnInserterFn>
   void align_variant_by_name_and_type(ColumnObject& dst, const ColumnObject& 
src, size_t row_cnt,
                                       ColumnInserterFn inserter) {
       CHECK(dst.is_finalized() && src.is_finalized());
       // Use rows() here instead of size(), since size() will check_consistency
       // but we could not check_consistency since num_rows will be upgraded 
even
       // if src and dst is empty, we just increase the num_rows of dst and fill
       // num_rows of default values when meet new data
       size_t num_rows = dst.rows();
   ```
   
   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem summary
   
   Describe your changes.
   
   ## Checklist(Required)
   
   * [ ] Does it affect the original behavior
   * [ ] Has unit tests been added
   * [ ] Has document been added or modified
   * [ ] Does it need to update dependencies
   * [ ] Is this PR support rollback (If NO, please explain WHY)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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