Mogball commented on issue #4091: Fix merge_extra_filters URL: https://github.com/apache/incubator-superset/pull/4091#issuecomment-352906247 @nbonnotte I'm not sure what filters with `None` as `col` are for (or if that is the result of another issue). Is there something particular about your dataset? In any case I might change `return f['col'] + '__' + f['op']` to `return f['col'] if f['col'] else '__none' + '__' + f['op']` in case a filter with `None` as `col` shows up in both `filters` and/or `extra_filters`
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