refactor: use Expr Display impl

predicate/src/predicate.rs

@@ -234,12 +234,15 @@ impl fmt::Display for Predicate {
         }
 
         if !self.exprs.is_empty() {
-            // Expr doesn't implement `Display` yet, so just the debug version
-            // See https://github.com/apache/arrow-datafusion/issues/347
-            let display_exprs = self.exprs.iter().map(|e| format!("{:?}", e));
-            write!(f, " exprs: [{}]", iter_to_str(display_exprs))?;
+            write!(f, " exprs: [")?;
+            for (i, expr) in self.exprs.iter().enumerate() {
+                write!(f, "{}", expr)?;
+                if i < self.exprs.len() - 1 {
+                    write!(f, " ")?;
+                }
+            }
+            write!(f, "]")?;
         }
-
         Ok(())
     }
 }