Dandandan commented on code in PR #3859:
URL: https://github.com/apache/arrow-datafusion/pull/3859#discussion_r997164383


##########
datafusion/optimizer/src/filter_push_down.rs:
##########
@@ -529,7 +529,8 @@ fn optimize(plan: &LogicalPlan, mut state: State) -> 
Result<LogicalPlan> {
         }
         LogicalPlan::Analyze { .. } => push_down(&state, plan),
         LogicalPlan::Filter(filter) => {
-            let predicates = utils::split_conjunction(filter.predicate());
+            let filter_cnf = 
utils::CnfHelper::new().rewrite_to_cnf_impl(filter.predicate());
+            let predicates = utils::split_conjunction(&filter_cnf);

Review Comment:
   I wonder whether we should do this in filter pushdown or in the expression 
simplifier optimization?



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