AngersZhuuuu opened a new pull request #24973: [SPARK-28169] Fix  PushDown 
failed by "OR" expression 
URL: https://github.com/apache/spark/pull/24973
 
 
   ## What changes were proposed in this pull request?
   
   Spark can't push down filter condition of Or:
   
   Such as if I have a table default.test, his partition col is "dt",
   
   if I use query : 
   
   `select * from default.test where dt=20190625 or (dt = 20190626 and id in 
(1,2,3) )`
   
   In this case, Spark will resolve or condition as one expression, and since 
this expr has reference of "id", then it can't been push down.
   
   For this PR, it will extract deep relation of OR expression and push down 
this condition 
   ## How was this patch tested?
   

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