[API V2]What is mapping relation between character and event sourceID

Warcraft Logs
1

[API V2]What is mapping relation between character and event sourceID

I used below graphql query to parse my raid performance. e.g.

query{
  reportData{
    report(code:"rwG81bzxZvg3mDN9"){
      rankings
      events(startTime:14089632,endTime:14920070,fightIDs:[84],dataType:Casts,limit:10000,abilityID:28499){
        nextPageTimestamp
        data
      }
    }
  }
}

There are sourceID from events but it is obviously not mapping to rankings character id.
So how could I find which character cast something according to event sourceId?
How is the event source ID created?

Thanks

2

Get the masterData for the report.

3

You can also set useActorIDs to false if you just want to get the detailed actor info without having to fetch the master data.