When you try to use a column of type JSON, tegola fails:

util.go:155: 114 type is not supported. (Expected it to be a stringer type)
map.go:202: err fetching tile (z: 7, x: 64, y: 46) features: for layer (cities-point) unable to convert field [3] (string) of type (114 - json) to a suitable value: map[dates:map[2017:3044 2018:4] simplified:[]]

It would be awesome if it could be supported

Description

We need to prevent crash when configuring a default background without a source and name
example here

How to reproduce

• see the mailing list to know which config you need to have locally
• ed