yjshen commented on code in PR #3363:
URL: https://github.com/apache/arrow-datafusion/pull/3363#discussion_r963266214


##########
datafusion-examples/examples/custom_datasource.rs:
##########
@@ -243,8 +243,8 @@ impl ExecutionPlan for CustomExec {
             db.data.values().cloned().collect()
         };
 
-        let mut id_array = UInt8Builder::new(users.len());
-        let mut account_array = UInt64Builder::new(users.len());
+        let mut id_array = UInt8Builder::new();

Review Comment:
   UInt8Builder is for primitive type UInt8, and its `with_capacity` takes only 
one parameter?
   ```rs
   /// Creates a new primitive array builder with capacity no of items
       pub fn with_capacity(capacity: usize) -> Self {
   ```



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