huaxingao commented on issue #28170: [SPARK-31369][SQL][DOCS] Documentation for JSON Functions URL: https://github.com/apache/spark/pull/28170#issuecomment-611913191 When I did https://github.com/apache/spark/pull/28157, I actually changed the built-in function page to the following <img width="1050" alt="Screen Shot 2020-04-09 at 11 58 36 PM" src="https://user-images.githubusercontent.com/13592258/78970411-156c1080-7abe-11ea-82b7-84e6a83bb7cf.png";> I think aggregation function and window function are worthwhile to document separately. We need to document Window function for sure because in query section, we have ```[ WINDOW { named_window [ , WINDOW named_window, ... ] } ]``` So we need an introduction page to explain what window function is, how to use it, and what window functions Spark supports. Aggregation function is very important, and it can be used as window function as well, so it would be worth having a page to document this too. @gatorsmile WDYT?
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