Fix https://github.com/vega/polestar/issues/348 -- now we can select raw date without timeunit
Fix https://github.com/vega/polestar/issues/348 -- now we can select raw date without timeunit

uwdata/vega-lite-ui,vega/vega-lite-ui,uwdata/vega-lite-ui,vega/vega-lite-ui,vega/vega-lite-ui,uwdata/vega-lite-ui