SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function mapFromArrays (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'[1,2]\'
        Literal \'Array(Nullable(UInt8))\'
      Literal Array_[UInt64_3, UInt64_4]