alamb commented on a change in pull request #1319:
URL: https://github.com/apache/arrow-datafusion/pull/1319#discussion_r754659853
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File path: datafusion/src/logical_plan/expr.rs
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@@ -1349,6 +1349,15 @@ pub fn unnormalize_cols(exprs: impl IntoIterator<Item =
Expr>) -> Vec<Expr> {
exprs.into_iter().map(unnormalize_col).collect()
}
+/// Recursively un-alias an expressions
Review comment:
The "recursively" part may be misleading, this function unwraps all
current aliases
So an expr like `(a as "foo") + (b as "bar")` will not be unaliased, but an
expr like `(a as "foo") as "bar"` will be unaliased to "foo"
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