[GitHub] SCdF commented on issue #1204: view queries default to map unless a reduce is defined and then they run reduce

[GitBox <gi...@apache.org>]

SCdF commented on issue #1204: view queries default to map unless a reduce is defined and then they run reduce
URL: https://github.com/apache/couchdb/issues/1204#issuecomment-370734359
 
 
   I also found this very confusing. I think because (at least for me) the vast majority of view usage is without a corresponding reduce, it's not something that you come across much, and it's a pretty radical change that is only passively documented in the query param list.
   
   I think it might be worth modifying the documentation to pull this effect[1] into a warning documentation block to highlight it, and include an explanation to get everyone on the same page.
   
   Something like:
   
   > **Warning**
   > By default, querying a view runs its reduce function if it has one. This can be confusing if you are used to just using map functions, and are adding a reduce function to an existing view. This happens because <explanation goes here />
   
   [1] That all view queries automatically become reduce queries when you add a reduce

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