SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function arrayJoin (alias x) (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 2)
        Function count (children 1)
         ExpressionList
        Function plus (children 1)
         ExpressionList (children 2)
          Function count (children 1)
           ExpressionList
          Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier count
   Literal UInt64_1
   ExpressionList (children 1)
    Identifier x