zhengruifeng commented on issue #27600: [MINOR][ML] ML cleanup URL: https://github.com/apache/spark/pull/27600#issuecomment-588020643 This should be a bug in scala-plugin of IDEA, it can not correctly infer the types if `.view` is used. ![image](https://user-images.githubusercontent.com/7322292/74799971-0910d600-530d-11ea-8fb0-5498b3012eab.png) After change `.view` to `.iterator`: ![image](https://user-images.githubusercontent.com/7322292/74800023-2b0a5880-530d-11ea-8dfc-1e3d6a5c23aa.png)
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