hqx871 opened a new pull request, #36352:
URL: https://github.com/apache/doris/pull/36352

   ## Proposed changes
   
   Issue Number: close #xxx
   
   <!--Describe your changes.-->
   
   For uniq and agg table, Sometimes use will compute md5 value of some key 
columns and put md5 as key while put those key as value. For example
   - when key column is too many, using md5 as key will reduce readed key 
columns as agg/uniq table will need to read all the key columns although user 
do not select those key columns
   - use may need to use array as key, but current doris does not support
   
   To improve those cases, I add a table property 'second_key' to let ScanNode 
to push predicates of those key columns to rowset.


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