EmmyMiao87 opened a new pull request, #9954:
URL: https://github.com/apache/incubator-doris/pull/9954

   # Proposed changes
   
   Closed #7901
   
   ## Problem Summary
   
   In a vectorized scenario, the query plan will generate a new tuple for the 
join node.
   This tuple mainly describes the output schema of the join node.
   Adding this tuple mainly solves the problem that the input schema of the 
join node is different from the output schema.
   For example:
   1. The case where the null side column caused by outer join is converted to 
nullable.
   2. The projection of the outer tuple.
   
   * Since this function is unavailable for non-vectorized code,
   the new attributes vOutputTupleDesc and vSrcToOutputSMap accompanying this 
function are unique to vectorization.*
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: (Yes/No/I Don't know)
   2. Has unit tests been added: (Yes/No/No Need)
   3. Has document been added or modified: (Yes/No/No Need)
   4. Does it need to update dependencies: (Yes/No)
   5. Are there any changes that cannot be rolled back: (Yes/No)
   
   ## 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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