Each column inn your view is a dimension of your data and each dimension can be used in x, y, color and size configuration elements. Dimension of your data can have one of following types:

• Category - data that can't be compared, enumerations like type of cars, countries. For category like dimension default scale is ordinal.
• Order - data that can be only ordered, like enumerations. Default scale here is ordinal.
• Measure - data that can be ordered and subtract (subtraction of dates is a duration, subtraction of integer is an integer, etc...). Default scale - linear.

Smart QL charts support following scales: ordinal, linear, color, logarithmic, fill, identity, period, size, time, value.

Configuration

You can change default mapping of a column from your view to a dimension type by using dimensions element in a gadget configuration.

{
	"type":  ...,
	"x": "columnA",
	"y": "columnB",
	"size": "columnC",
	"color": "columnD",
	...
	"dimensions" :{
		"columnA" : {
			"type": type-for-columnA,
			dimension-configuration-for-columnA
		},
		"columnB" : {
			type": type-for-columnA,
			dimension-configuration-for-columnB
		},
		...
	}
	...
}

Configuration for type order

With casting your column to order type dimension you can set the appropriate precedence of values you like. 

{
	...
	"x": "priority"
	...
	"dimensions": {
		"priority": {
			"type": "order",
			"order": ["Low", "Medium", "High"]
		}
	}
}

Configuration of date/time like dimensions

Having a column with a date/time/datetime you can use it either as ordered group of periods or continuous timeline.

{
	...
	"x": "created"
	...
	"dimensions": {
		"created": {
			"type": "order",
			"scale": "period"
		}
	}
}

{
	...
	"x": "created"
	...
	"dimensions": {
		"created": {
			"type": "measure",
			"scale": "time"
		}
	}
}