tonysun83 commented on issue #962: Mango: generate a warning instead of an error when an user-specified index cannot be used URL: https://github.com/apache/couchdb/pull/962#issuecomment-342679529 I need to think about this some more. Falling back on _all_docs is one thing, but I'm a little concerned about switching between indexes. Some initial thoughts: 1) Can we guarantee the same results between switched indexes (i.e json vs text?) 2) If a user doesn't read the warning message, and decides to delete the substitute index then we're forced to fall back on _all_docs. If this leads to a performance degradation, would the user want to rebuild the substitute index?
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