huaxingao commented on issue #28203: [SPARK-31434][SQL][DOCS] Drop builtin function pages from SQL references URL: https://github.com/apache/spark/pull/28203#issuecomment-613157410 The auto-generated API doc has the function description, but it doesn't cover the detailed usage such as how to mark the function as window function, how to define the window spec, what's inside the window spec, etc. Window function is quite important and complex, so we need more documentation than function description. I discussed with @gatorsmile earlier today, if we can't document window function here, he wants me to have detailed documentation for all these window functions in SQL syntax section.
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