SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayMap (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function plus (children 1)
         ExpressionList (children 2)
          Function toLowCardinality (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
          Function CAST (children 1)
           ExpressionList (children 2)
            Literal \'1\'
            Literal \'Nullable(UInt8)\'
      Literal Array_[UInt64_1]
