for array data sources:object
-
- label for value in array
- select as label for value in array
- label group by group for value in array
- select as label group by group for value in array track by trackexpr
for object data sources:select
-
- label for (key , value) in object
- select as label for (key , value) in object
- label group by group for (key, value) in object
- select as label group by group for (key, value) in ob