robdiciuccio commented on pull request #12903:
URL: https://github.com/apache/superset/pull/12903#issuecomment-772953339


   > Currently users have to select "Is temporal" for a column to appear in the 
Time Column select. So this inference is at least guaranteed to be consistent 
with the Time column choices.
   
   The "is temporal" option is automatically checked for certain column types 
when creating a dataset, so many users are likely unaware of these column 
settings. My main point was, if this column type auto-detection fails for 
whatever reason, the time filter options will be fully hidden from the user, 
even though there may be a viable temporal column that just needs to be 
manually configured.
   
   > If the Time column choice is empty, then filtering by time range is indeed 
impossible for the specific chart, right?
   
   Yes, we display a "No options" message in the filter column selector. 
Perhaps the existing time filter UI could be replaced in this case with a 
message (only visible upon toggling the filter open) saying "there are no 
temporal columns configured for this dataset, click here to add one."


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