Github user mengxr commented on the pull request: https://github.com/apache/spark/pull/7325#issuecomment-120140887 Just realized one issue with adding the `@since` tag. For overloaded methods, it inherits the doc from its parent if no JavaDoc is provided. However, if we want to add `@since`, we have to add JavaDoc. Then we need to copy the JavaDoc from parent, which makes it hard to keep docs in sync. @rxin Is it better to implement `@since` as an annotation?
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