alamb commented on code in PR #4464:
URL: https://github.com/apache/arrow-datafusion/pull/4464#discussion_r1038769522


##########
datafusion/expr/src/logical_plan/plan.rs:
##########
@@ -1193,9 +1193,9 @@ pub struct SubqueryAlias {
 #[derive(Clone)]
 pub struct Filter {
     /// The predicate expression, which must have Boolean type.
-    predicate: Expr,
+    pub predicate: Expr,

Review Comment:
   Maybe we can at least document what invariants are required between fields



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