waynexia commented on code in PR #6097:
URL: https://github.com/apache/arrow-datafusion/pull/6097#discussion_r1174576436


##########
datafusion/core/tests/sqllogictests/test_files/groupby.slt:
##########
@@ -58,3 +58,9 @@ SELECT 38 FROM tab0 AS cor0 GROUP BY cor0.col1, cor0.col1;
 ----
 38
 38
+
+query I rowsort
+SELECT cor0.col1 AS col2 FROM tab0 AS cor0 GROUP BY cor0.col1, cor0.col1;

Review Comment:
   :+1: 



##########
datafusion/common/src/dfschema.rs:
##########
@@ -217,20 +216,7 @@ impl DFSchema {
                 (None, Some(_)) | (None, None) => field.name() == name,
             })
             .map(|(idx, _)| idx);
-        match matches.next() {
-            None => Ok(None),
-            Some(idx) => match matches.next() {
-                None => Ok(Some(idx)),
-                // found more than one matches
-                Some(_) => Err(DataFusionError::Internal(format!(
-                    "Ambiguous reference to qualified field named {}.{}",
-                    qualifier
-                        .map(|q| q.to_quoted_string())
-                        .unwrap_or("<unqualified>".to_string()),
-                    quote_identifier(name)
-                ))),
-            },
-        }
+        Ok(matches.next())

Review Comment:
   nit: this function won't return error now



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