alamb commented on code in PR #2464:
URL: https://github.com/apache/arrow-datafusion/pull/2464#discussion_r867025019
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datafusion/expr/src/expr.rs:
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@@ -251,6 +251,77 @@ pub enum Expr {
QualifiedWildcard { qualifier: String },
}
+/// Recursively find all columns referenced by an expression
+pub fn find_columns_referenced_by_expr(e: &Expr) -> Vec<Column> {
Review Comment:
I think this code could use an ExprVisitor to avoid having to do the
recursion itself (and potentially missing some case)
I took a crack at doing so
https://github.com/apache/arrow-datafusion/pull/2471
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