jonahgao commented on code in PR #14102:
URL: https://github.com/apache/datafusion/pull/14102#discussion_r1912741556
##########
datafusion/expr/src/utils.rs:
##########
@@ -379,14 +379,12 @@ fn get_exprs_except_skipped(
}
}
-/// Resolves an `Expr::Wildcard` to a collection of `Expr::Column`'s.
-pub fn expand_wildcard(
- schema: &DFSchema,
- plan: &LogicalPlan,
- wildcard_options: Option<&WildcardOptions>,
-) -> Result<Vec<Expr>> {
+/// For each column specified in the USING JOIN condition, the JOIN plan
outputs it twice
+/// (once for each join side), but an unqualified wildcard should include it
only once.
+/// This function returns the columns that should be excluded.
+fn exclude_using_columns(plan: &LogicalPlan) -> Result<HashSet<Column>> {
Review Comment:
This function is extracted from `expand_wildcard`, so that we can reuse it
in `exprlist_to_fields`.
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