[feature](statistics) Statistics derivation.Step 1:ScanNode implement… #9258
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Proposed changes
Issue Number: close #9241
association PR: #8947
Problem Summary:
The purpose of this function is to modify the derivation of the current statistics.
There are two modifications:
The statistical information derivation is removed from the Node node.
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.
Checklist(Required)
Further comments
If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...