SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function if (alias x) (children 1)
     ExpressionList (children 3)
      Literal UInt64_0
      Function tuple (children 1)
       ExpressionList (children 1)
        Literal UInt64_0
      Function tuple (children 1)
       ExpressionList (children 1)
        Literal UInt64_1
   ExpressionList (children 1)
    Identifier x