alamb commented on a change in pull request #605:
URL: https://github.com/apache/arrow-datafusion/pull/605#discussion_r657469588



##########
File path: datafusion/src/logical_plan/dfschema.rs
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@@ -387,6 +402,9 @@ impl Display for DFSchema {
 pub struct DFField {
     /// Optional qualifier (usually a table or relation name)
     qualifier: Option<String>,
+    /// Optional set of qualifiers that all share this same field. This is 
used for `JOIN USING`

Review comment:
       sounds good




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