LiaCastaneda commented on code in PR #16454:
URL: https://github.com/apache/datafusion/pull/16454#discussion_r2158698230
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datafusion/expr/src/logical_plan/builder.rs:
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@@ -1667,6 +1667,34 @@ pub fn build_join_schema(
dfschema.with_functional_dependencies(func_dependencies)
}
+/// (Re)qualify the sides of a join if needed, i.e. if the columns from one
side would otherwise
+/// conflict with the columns from the other.
+/// This is especially useful for queries that come as Substrait, since
Substrait doesn't currently allow specifying
+/// aliases, neither for columns nor for tables. DataFusion requires columns
to be uniquely identifiable, in some
+/// places (see e.g. DFSchema::check_names).
+pub fn requalify_sides_if_needed(
Review Comment:
I moved this helper function to the logical plan `builder` module since now
its not used only by the substrait consumer but also by plan.rs.
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