SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function any (children 1)
     ExpressionList (children 1)
      Function if (children 1)
       ExpressionList (children 3)
        Function if (alias a_) (children 1)
         ExpressionList (children 3)
          Identifier x
          Literal UInt64_1
          Literal UInt64_2
        Identifier a_
        Literal UInt64_0
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias x)