jonahgao commented on code in PR #12467:
URL: https://github.com/apache/datafusion/pull/12467#discussion_r1764569717
##########
datafusion/common/src/dfschema.rs:
##########
@@ -412,17 +412,32 @@ impl DFSchema {
}
}
+ /// Check whether the column reference is ambiguous
+ pub fn check_ambiguous_name(
Review Comment:
I think the newly introduced functions `qualified_field_with_qualified_name`
and `qualified_fields_with_qualified_name` do more than what we need. They
might be unnecessary.
If I understand correctly, this function can be implemented as follows:
```rust
pub fn check_ambiguous_name(
&self,
qualifier: Option<&TableReference>,
name: &str,
) -> Result<()> {
let count = self
.iter()
.filter(|(field_q, f)| match (field_q, qualifier) {
(Some(q1), Some(q2)) => q1.resolved_eq(q2) && f.name() ==
name,
(None, None) => f.name() == name,
_ => false,
})
.take(2)
.count();
if count > 1 {
_schema_err!(SchemaError::AmbiguousReference {
field: Column {
relation: None,
name: name.to_string(),
},
})
} else {
Ok(())
}
}
```
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