[GitHub] [arrow-datafusion] jackwener commented on a diff in pull request #5452: fix: build union schema with child has same column name but qualifier…

["jackwener (via GitHub)" <gi...@apache.org>]

jackwener commented on code in PR #5452:
URL: https://github.com/apache/arrow-datafusion/pull/5452#discussion_r1123270256


##########
datafusion/expr/src/logical_plan/builder.rs:
##########
@@ -1101,7 +1101,7 @@ pub fn union(left_plan: LogicalPlan, right_plan: LogicalPlan) -> Result<LogicalP
                     })?;
 
             Ok(DFField::new(
-                None,
+                left_field.qualifier().map(|x| &**x),

Review Comment:
   ```suggestion
                   left_field.qualifier().map(|x| x.as_ref()),
   ```



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