alamb commented on code in PR #4916:
URL: https://github.com/apache/arrow-datafusion/pull/4916#discussion_r1070579121
##########
datafusion/expr/src/utils.rs:
##########
@@ -83,20 +85,16 @@ pub fn grouping_set_to_exprlist(group_expr: &[Expr]) ->
Result<Vec<Expr>> {
}
}
-/// Recursively walk an expression tree, collecting the unique set of column
names
+/// Recursively walk an expression tree, collecting the unique set of columns
Review Comment:
here is a pretty good example of reducing the ceremony required do to a walk
of an expr by using `inspect_expr_pre` rather than having to define a visitor
explicitly
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