SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function mapFromArrays (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function toLowCardinality (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
        Function toLowCardinality (children 1)
         ExpressionList (children 1)
          Literal UInt64_2
      Literal Array_[UInt64_4, UInt64_5]