davidvrba commented on issue #27231: [SPARK-28478][SQL] Remove redundant null 
checks
URL: https://github.com/apache/spark/pull/27231#issuecomment-578522004
 
 
   @cloud-fan @maropu  do you have any more suggestions / comments / 
recommendations to this pr? In the last commit i added a bit of generalization 
to include cases where the null-checked column is not necessarily a _direct_ 
child of the `ifNotNullExpr`.

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