englefly opened a new pull request, #34704:
URL: https://github.com/apache/doris/pull/34704

   ## Proposed changes
   when the runtime filter target to a constant, the 
PushDownContext.finalTarget is null.
   in this case, do not pushdown runtime filter.
   example:
   select * from (select 1 as x from T1) T2 join T3 on T2.x=T3.x
   when push down RF(T3.x->T2.x) inside  "select 1 as x from T1", the column x 
is a constant, and the pushDown stopped.
   
   Issue Number: close #xxx
   
   <!--Describe your changes.-->
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[[email protected]](mailto:[email protected]) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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