You can use complex operators in mappings that run on the Spark engine.

The following table lists the complex operators in the transformation language:

Operator	Meaning
[ ]	Subscript operator. Use a subscript operator to access one or more elements in an array. You can also use a subscript operator to access the value corresponding to a given key in a key-value pair of a map.
.	Dot operator. Use a dot operator to access an element in a struct. You can also use a dot operator in an array of structs to access elements in each struct.

When you use a dot operator in an array of structs, it returns the elements of the same name within each struct as an array. To access elements in a nested array or struct, you can use a combination of complex operators.