rkrishn7 commented on code in PR #14387:
URL: https://github.com/apache/datafusion/pull/14387#discussion_r1937632262
##########
datafusion/core/tests/dataframe/mod.rs:
##########
@@ -1121,6 +1121,39 @@ async fn join() -> Result<()> {
Ok(())
}
+#[tokio::test]
+async fn join_coercion_unnnamed() -> Result<()> {
+ let ctx = SessionContext::new();
+
+ // Test that join will coerce column types when necessary
+ // even when the relations don't have unique names
Review Comment:
Question: when the columns don't have unique names, is it safe to assume
that the unqualified columns in `left_cols`/`right_cols` refer to the
left/right relations, respectively? Since technically a valid join predicate is
for example, `t1.id = t1.id`.
Seems like it would make sense to me most of the time! But there is some
level of implicitness here.
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