alamb commented on code in PR #7792:
URL: https://github.com/apache/arrow-datafusion/pull/7792#discussion_r1355741931
##########
datafusion/core/src/dataframe.rs:
##########
@@ -1855,6 +1852,131 @@ mod tests {
Ok(())
}
+ // Test issue: https://github.com/apache/arrow-datafusion/issues/7790
+ // The join operation outputs two identical column names, but they belong
to different relations.
+ #[tokio::test]
+ async fn with_column_join_same_columns() -> Result<()> {
Review Comment:
I verified this fails with
```
Error: SchemaError(AmbiguousReference { field: Column { relation: None,
name: "c1" } })
```
Without the code change on this branch.
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