[GitHub] [arrow-rs] heyrutvik commented on issue #1841: Implement Extend for Builder

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heyrutvik commented on issue #1841:
URL: https://github.com/apache/arrow-rs/issues/1841#issuecomment-1178178695

   @tustvold I'm trying to understand the ticket. If I'm not wrong, `Extend` will provide us `extend` method and then we can extend an existing builder using an iterator.
   
   Example,
   ```
   let ints = [1, 2, 3];
   let mut builder = Int32Builder::new(0);
   builder.extend(ints.into_iter());
   let array = builder.finish();
   assert_eq!(3, array.len());
   ```
   given that we have `impl Extend<i32> for Int32Builder` implemented. 
   
   I'm confused because you mentioned `Extend` and not using any of its method in your example snippet. I believe `collect` is the main focus of your example which builds collection from an iterator. Could you please elaborate?  


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