xudong963 commented on code in PR #15906:
URL: https://github.com/apache/datafusion/pull/15906#discussion_r2068952607
##########
datafusion/expr/src/expr_rewriter/mod.rs:
##########
@@ -131,13 +131,25 @@ pub fn normalize_sorts(
}
/// Recursively replace all [`Column`] expressions in a given expression tree
with
-/// `Column` expressions provided by the hash map argument.
-pub fn replace_col(expr: Expr, replace_map: &HashMap<&Column, &Column>) ->
Result<Expr> {
Review Comment:
I don't wanna write a similar method for the PR, so made the method generic
```rust
pub fn replace_col_with_expr(
expr: Expr,
replace_map: &HashMap<Column, &Expr>,
) -> Result<Expr> {
expr.transform(|expr| {
Ok({
if let Expr::Column(c) = &expr {
match replace_map.get(c) {
Some(new_expr) =>
Transformed::yes((**new_expr).to_owned()),
None => Transformed::no(expr),
}
} else {
Transformed::no(expr)
}
})
})
.data()
}
```
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