Consider that map of India geo json is selected for creating maps. If I use an identifier like "region" in joinBy option which is multi-valued i.e. many states have the same region, what would be displayed on the map?
http://jsfiddle.net/amrutaJgtp/2r2nfz97/3/
In the above fiddle, I've given region as joinBy
data: data,
mapData: Highcharts.maps['countries/in/in-all'],
joinBy: 'region',
name: 'Random data',
As seen in the output, the map shown is incorrect. What is the reason for this? Should the identifier used for joinBy option be unique to the mapData (1:1 relationship between mapData and data)?