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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