SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function URLHash (children 1)
       ExpressionList (children 2)
        Literal \'\' (alias url)
        Literal UInt64_0
      Function URLHash (children 1)
       ExpressionList (children 1)
        Identifier url