zhengshiJ opened a new pull request, #8947:
URL: https://github.com/apache/incubator-doris/pull/8947

   The purpose of this function is to modify the derivation of the current 
statistics. 
   There are two modifications: 
   1. The statistical information derivation is removed from the Node node.
   2. Modify the current way of obtaining cardinality, and change it to obtain 
it from statistical information. 
   For details on the modification method, see: 
https://shimo.im/docs/473QyOzWBjHMlZ3w
   The implementation of this function is divided into multiple submissions, 
and this submission implements the derivation of scan_node statistics.
   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem Summary:
   
   The derivation of the current statistical information is coupled in the node 
node, and the method of calculating the cardinality is carried out by the mock 
method, and the ndv value is not obtained correctly.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: (No)
   2. Has unit tests been added: (No)
   4. Has document been added or modified: (No Need)
   5. Does it need to update dependencies: (No)
   6. Are there any changes that cannot be rolled back: (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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