xrmx opened a new issue #4830: time grains broken in sqlite
URL: https://github.com/apache/incubator-superset/issues/4830
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   - [x] I have checked the superset logs for python stacktraces and included 
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   - [ ] I have reproduced the issue with at least the latest released version 
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   ### Superset version
   master from ~1 month ago 97afcd5809269e885a0dde349081802a427c5674
   ### Expected results
   hour, week and month time grains work fine
   ### Actual results
   The result is that hour time grains display a broken chart, while week and 
month fallback to the day as time grain.
   Problem is that sqlite time grains use strftime and thus the `%` that gets 
escaped breaking the query:
   SELECT DATETIME(STRFTIME('%%Y-%%m-%%dT%%H:00:00', ts)) AS __timestamp,
          SUM(prezzo) AS sum__prezzo
   FROM prova12
   WHERE ts >= '2017-09-15 00:00:00.000000'
     AND ts <= '2018-04-15 12:14:41.000000'
   GROUP BY DATETIME(STRFTIME('%%Y-%%m-%%dT%%H:00:00', ts))
   ORDER BY sum__prezzo DESC
   LIMIT 50000
   OFFSET 0;
   ### Steps to reproduce
   On a Time series line chart querying a sqlite database use hour, week or 
month as time grain. 

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