Correctly infer date

[kanitw]

• Somehow in Voyager we infer date field in cars.json as date field but not in CompassQL.
  However, using datalib we only get it as integer/number. We need to investigate why such difference happens. (See "Univariate Summary" example in the editor.)

[kanitw]

• We have similar problem in Vega-Lite-UI, which does not recognize Release_Date in movies.json as time.
• try browsing other example dataset in Voyager

[kanitw]

• crimea is also incorrect according to Crimea data not a good sample data set polestar#354

[kanitw]

Release Date is just a year.

[RileyChang]

From discussion:

• no good way to infer date, must provide a way for user to provide that through a new API
• can pass the date format to vega-lite (once it is supported) e.g. parse: "data:%y" for dates that are just a year

[kanitw]

Correction:

From discussion:

• no good way to infer year, must provide a way for user to provide that through a new API
• can pass the date format to vega-lite (once it is supported) e.g. parse: "data:%y" for dates that are just a year

[kanitw]

Bumping this up.

From "Univariate Summary" Demo: year is inferred as string -- I'm not sure how should we address this, but definitely should address it ASAP.

[kanitw]

It seems like the year field in vega-datasets's cars.json is different from the one in polestar/voyager.