[GitHub] [arrow-datafusion] Dandandan commented on a change in pull request #689: Remove qualifiers on pushed down predicates / Fix parquet pruning

[GitBox <gi...@apache.org>]

Dandandan commented on a change in pull request #689:
URL: https://github.com/apache/arrow-datafusion/pull/689#discussion_r664828470



##########
File path: datafusion/src/logical_plan/expr.rs
##########
@@ -1150,6 +1150,38 @@ pub fn normalize_cols(
         .collect()
 }
 
+/// Recursively 'unnormalize' (remove all qualifiers) from an
+/// expression tree.
+///
+/// For example, if there were expressions like `foo.bar` this would
+/// rewrite it to just `bar`.
+pub fn unnormalize_col(expr: Expr) -> Expr {
+    struct RemoveQualifier {}
+
+    impl ExprRewriter for RemoveQualifier {
+        fn mutate(&mut self, expr: Expr) -> Result<Expr> {
+            if let Expr::Column(col) = expr {
+                //let Column { relation: _, name } = col;

Review comment:
       ```suggestion
   ```




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