x/yOffset within a continuous scale

[kanitw]

In #7684, we can't add xOffset encoding inside quantitative x scale at all.

However, it might make sense to do something like this to draw error bar:

encoding: {
  x: {aggregate: 'mean', 'field': 'value'},
  y: {field: 'category'}
},
layer: [{
  mark: 'circle', 
}, {
  mark: 'rule', 
  encoding: {
    xOffset: {aggregate: 'stdev', field: 'value'},
    xOffset2: {aggregate: 'stdev', field: 'value', multiply: -1} // also need to add `multiply` like in Vega? 
  }
}]

[PBI-David]

Here is a stack overflow question that looks related.

https://stackoverflow.com/questions/74021286/showing-gaps-in-ordinal-time-based-data-in-vega-lite?noredirect=1#comment130713049_74021286

It seems that xOffset doesn't properly support temporal datatypes (which is continuous but also logically discrete at the same time as there are only 4 quarters).