array_union function
Applies to:  Databricks SQL 
 Databricks Runtime
Returns an array of the elements in the union of array1 and array2 without duplicates.
Syntax
array_union(array1, array2)
Arguments
- array1: An ARRAY.
- array2: An ARRAY of the same type as- array1.
Returns
An ARRAY of the same type as array.
Examples
SQL
> SELECT array_union(array(1, 2, 2, 3), array(1, 3, 5));
 [1,2,3,5]