[GitHub] [arrow-datafusion] andygrove commented on a diff in pull request #2549: feat: support for AnyExpression

[GitBox <gi...@apache.org>]

andygrove commented on code in PR #2549:
URL: https://github.com/apache/arrow-datafusion/pull/2549#discussion_r888513961


##########
datafusion/expr/src/expr.rs:
##########
@@ -99,6 +99,15 @@ pub enum Expr {
         /// Right-hand side of the expression
         right: Box<Expr>,
     },
+    /// A binary expression such as "age > 21"
+    AnyExpr {
+        /// Left-hand side of the expression
+        left: Box<Expr>,
+        /// The comparison operator
+        op: Operator,
+        /// Right-hand side of the expression
+        right: Box<Expr>,

Review Comment:
   The `Expr` here could be an `Expr::ScalarSubquery` to cover the subquery case (assuming that we only need to support subqueries that select a single column?)



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