I face the same issue. I use postgresql I will get Unexpected error while using time series char if I select time grain. (my date time type is timestamp without time zone)
<img width="821" alt="screen shot 2018-09-11 at 12 55 38 am" src="https://user-images.githubusercontent.com/1135507/45311969-7091f600-b55d-11e8-9218-16b47d7fc227.png"> <img width="893" alt="screen shot 2018-09-11 at 12 55 32 am" src="https://user-images.githubusercontent.com/1135507/45311970-7091f600-b55d-11e8-873f-eea434995fb1.png"> <img width="904" alt="screen shot 2018-09-11 at 12 55 22 am" src="https://user-images.githubusercontent.com/1135507/45311971-7091f600-b55d-11e8-94a3-f35af4dad1d9.png"> [ Full content available at: https://github.com/apache/incubator-superset/issues/5700 ] This message was relayed via gitbox.apache.org for [email protected]
