alamb commented on a change in pull request #9278:
URL: https://github.com/apache/arrow/pull/9278#discussion_r561197743
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File path: rust/datafusion/src/optimizer/utils.rs
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@@ -46,75 +50,48 @@ pub fn exprlist_to_column_names(
/// Recursively walk an expression tree, collecting the unique set of column
names
/// referenced in the expression
-pub fn expr_to_column_names(expr: &Expr, accum: &mut HashSet<String>) ->
Result<()> {
Review comment:
This is a pretty good example of the kind of repetition that can be
removed using this visitor pattern.
Note that I still left all expr types enumerated so that anyone who adds a
new Expr type need to update this code, and (hopefully) think if they need to
add special handling for that new expr types
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