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 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org