Dandandan commented on a change in pull request #519:
URL: https://github.com/apache/arrow-datafusion/pull/519#discussion_r646164764
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File path: datafusion/src/sql/utils.rs
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@@ -390,6 +390,42 @@ pub(crate) fn extract_aliases(exprs: &[Expr]) ->
HashMap<String, Expr> {
.collect::<HashMap<String, Expr>>()
}
+/// Returns mapping of each position (`String`) to the expression (`Expr`) it
is
+/// aliasing.
+pub(crate) fn extract_positions(exprs: &[Expr]) -> HashMap<String, Expr> {
+ let mut position = 0;
+ exprs
+ .iter()
Review comment:
You could use the `enumerate` function here to generate the `position`
values.
https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.enumerate
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